JP2023076885A - recording device - Google Patents

Abstract

To solve the problem that a pinion pushes up a rack member, which sometimes makes an attitude of a line head unstable, in a configuration in which a rack pinion mechanism moves the head unit.SOLUTION: A head unit comprises a recording head, which can move between a recording position where the unit performs recording on a medium and a retreat position where the unit retreats from a medium conveyance path. A guide surface guides the head unit in a moving direction of the head unit. The moving direction of the head unit is a direction crossing both directions of a horizontal direction and a vertical direction. The head unit is moved by a rack pinion. Directions of tooth widths of a rack and a pinion are along a normal direction of the guide surface.SELECTED DRAWING: Figure 11

Description

The present invention relates to a recording apparatus that records on a medium.

Japanese Unexamined Patent Application Publication No. 2002-200002 discloses a mechanism for moving a line head that ejects ink in an inkjet printer between a recording position and a retracted position. A support frame is attached to both longitudinal ends of the line head, and the support frame is provided with a rack member. A toothed portion is formed on the rack member, and the toothed portion meshes with the pinion to constitute a rack and pinion mechanism, and the line head is configured to move between the recording position and the retracted position by the rotation of the pinion. there is

In addition, rotatable rollers are provided at both ends of the line head in the longitudinal direction, and the line head is guided in the movement direction by placing the rollers on the guide rails.
When the line head is at the recording position, the line head is pressed against the eccentric cam to define the recording position.

JP 2021-121483 A

In the configuration described in Patent Document 1, the toothed portion of the rack member is formed on the lower surface of the rack member, and the pinion that meshes with the toothed portion of the rack member is positioned below the toothed portion of the rack member. Therefore, when the pinion applies an external force to the teeth of the rack member in order to press the line head against the eccentric cam, the pinion pushes up the rack member, thereby lifting the rollers provided on the line head from the guide rail. The position of the line head may become unstable.
On the other hand, in the configuration in which the toothed portion of the rack member is formed on the upper surface of the rack member and the pinion is arranged above the toothed portion of the rack member, the line head cannot be removed upward, and the line head must be replaced. it gets harder.

A recording apparatus according to the present invention for solving the above problems is a unit comprising a medium transport path for transporting a medium, a recording head for performing recording on the medium transported through the medium transport path, and the recording head. a head unit movable between a recording position for recording on a medium and a retracted position for retracting from the medium transport path; a guide surface for guiding the head unit in a moving direction of the head unit; a moving mechanism for moving the head unit by applying a force along the movement direction of the head unit to the unit; and a motor as a power source of the moving mechanism, wherein the moving direction of the head unit is a horizontal direction or a direction crossing both the horizontal and vertical directions. The moving mechanism has a pinion that meshes with a rack that constitutes the head unit, and the tooth width direction of the rack and the pinion is along the normal direction of the guide surface.

FIG. 4 is a diagram showing the medium transport path of the printer, showing a state where the head unit is at the recording position; FIG. 4 is a diagram showing a medium transport path of the printer, showing a state where the head unit is at the retracted position; FIG. 4 is a perspective view of the head unit and the moving mechanism, showing a state where the head unit is at the recording position; FIG. 4 is a cross-sectional view of the head unit and the moving mechanism, showing a state where the head unit is at the recording position; FIG. 5 is a cross-sectional view of the head unit and the moving mechanism, showing a state where the head unit is at the retracted position; 3 is a perspective view of the head unit; FIG. FIG. 4 is a cross-sectional perspective view of the right guide member, showing a state where the head unit is at the recording position; FIG. 5 is a cross-sectional perspective view of the first left guide member and the second left guide member, showing a state where the head unit is at the recording position; FIG. 4 is a diagram schematically showing movement regions and positions of the head unit; FIG. 4 is a side view of the head unit, showing a state in which the head unit is in front of the recording position; FIG. 4 is a side view of the head unit, showing a state where the head unit is at the recording position; FIG. 4 is a plan view of the head unit, showing a state where the head unit is at the recording position; FIG. 11 is a side view of a head unit according to another embodiment, showing a state where the head unit is at the printing position; FIG. 11 is a side view of a head unit according to another embodiment, showing a state where the head unit is at the printing position;

The present invention will be briefly described below.
A recording apparatus according to a first aspect is a unit comprising a medium transport path for transporting a medium, a recording head for performing recording on the medium transported through the medium transport path, and the recording head, wherein the medium is recorded on the medium. and a retracted position retracted from the medium transport path, a guide surface for guiding the head unit in a moving direction of the head unit, and the head relative to the head unit. a moving mechanism that moves the head unit by applying a force along the movement direction of the unit; a positioning unit that defines a position; and a motor that is a power source of the moving mechanism. is provided with a pinion that meshes with a rack that constitutes the head unit, and the tooth width direction of the rack and the pinion is along the normal direction of the guide surface.

According to this aspect, the moving mechanism includes a pinion that meshes with the rack provided on the head unit, and the tooth width direction of the rack and the pinion is along the normal direction of the guide surface. The external force applied to the rack by the pinion is less likely to lift the head unit from the guide surface, and the posture of the head unit is stabilized.
In addition, when the head unit is moved in a direction away from the guide surface, the pinion is less likely to be an obstacle, thereby suppressing deterioration in workability of attaching and detaching the head unit.

In a second aspect, in the first aspect, the head unit includes a unit main body that includes the recording head and abuts on the positioning portion, and a unit main body that is positioned relative to the unit main body along the moving direction of the head unit. and a pressing member that is interposed between the unit body and the rack and presses the unit body toward the positioning portion when the head unit is at the recording position. Characterized by

According to this aspect, since the rack is displaceable relative to the unit main body, the head unit is moved toward the recording position and the unit main body is in contact with the positioning portion. The position control of the head unit is facilitated because high stopping accuracy is not required when stopping at .

A third aspect is the second aspect, wherein a straight line parallel to the moving direction of the head unit passes through the pinion and the positioning portion when viewed from the width direction that intersects the medium conveying direction. Characterized by

The external force applied to the rack by the pinion and the reaction force that the unit body receives from the positioning portion generate a moment that rotates the head unit when viewed in the width direction, making the posture of the head unit unstable. Let However, according to this aspect, a straight line parallel to the moving direction of the head unit passes through the pinion and the positioning portion when viewed from the width direction. The position where the unit main body receives the reaction force from the positioning portion becomes closer, thereby reducing the moment and stabilizing the attitude of the head unit.

In a fourth aspect based on the second aspect, the unit main body is supported by the guide surface, a part of the rack is inserted into the guide groove extending along the moving direction of the head unit, and the pressing member A pressing force for pressing the unit main body acts to press a part of the unit main body against the guide surface.

The external force applied to the rack by the pinion and the reaction force that the unit body receives from the positioning portion generate a moment that rotates the head unit when viewed in the width direction, making the posture of the head unit unstable. Let However, according to this aspect, first, since a part of the rack is inserted into the guide groove extending along the moving direction of the head unit, the external force applied to the rack by the pinion becomes the moment. Acting on the unit main body can be suppressed.
Next, in this configuration, the pressing force with which the pressing member presses the unit main body and the reaction force that the unit main body receives from the positioning portion generate a moment that rotates the head unit when viewed in the width direction. Although the posture of the head unit is made unstable, the pressing force of the pressing member pressing the unit main body acts to press a part of the unit main body against the guide surface. stabilizes.

According to a fifth aspect, in any one of the second to fourth aspects, the unit main body includes a first guided portion at one end in a width direction that intersects with the medium conveying direction, and A second guided portion and a third guided portion are provided at the other end in the width direction with a gap therebetween in the movement direction of the head unit, and the guide surface is a first guide that supports the first guided portion. a second guide surface that supports the second guided portion; and a third guide surface that supports the third guided portion. It is characterized in that it is supported at three points of the guided portion, the second guided portion, and the third guided portion.

According to this aspect, since the unit main body is configured to be supported at the recording position at three points, that is, the first guided portion, the second guided portion, and the third guided portion, the recording is performed. The posture of the head unit at the position is stabilized, and good recording quality can be obtained.

A sixth aspect is, in the fifth aspect, a first position where the first guided portion contacts the first guide surface, a second position where the second guided portion contacts the second guide surface, and The position of the center of gravity of the head unit is positioned at the first position, the second position, and the third position when viewed from a direction orthogonal to a plane including a third position where the third guided portion contacts the second guide surface. It is characterized by being within a triangular region connecting

According to this aspect, when viewed from a direction perpendicular to a plane including the first position, the second position, and the third position, the position of the center of gravity of the head unit corresponds to the first position, the second position, the third position, and the second position. and the third position, the posture of the head unit is stabilized.

A seventh aspect is characterized in that, in any one of the first to sixth aspects, the movement direction of the head unit is a direction intersecting both the horizontal direction and the vertical direction.
When the movement direction of the head unit is a direction that intersects both the horizontal direction and the vertical direction, the resistance received by the head unit from the guide surface is greater than when the movement direction of the head unit is along the horizontal direction. Although the force is reduced and the posture of the head unit tends to become unstable, the effect of the first aspect described above stabilizes the posture of the head unit.

The present invention will be specifically described below.
In the following, an inkjet printer 1 that performs recording by ejecting ink, which is an example of a liquid, onto a medium represented by recording paper will be described as an example of a recording apparatus. In the following, the inkjet printer 1 will be abbreviated as printer 1 .
The XYZ coordinate system shown in each drawing is an orthogonal coordinate system, and the Y-axis direction intersects the medium transport direction, that is, the medium width direction, and is also the apparatus depth direction. Of the Y-axis directions, the +Y direction is the direction from the front surface of the device to the rear surface of the device, and the -Y direction is the direction from the rear surface of the device to the front surface of the device. In the present embodiment, the Y-axis direction is an example of a width direction that intersects with the V-axis direction, which is the moving direction of the head unit 50, which will be described later.

The X-axis direction is the width direction of the device, and when viewed from the operator of the printer 1, the +X direction is the left side and the -X direction is the right side. The Z-axis direction is the vertical direction, which is the normal direction to the mounting surface G of the printer 1, that is, the device height direction. Of the Z-axis directions, the +Z direction is the upward direction, and the −Z direction is the downward direction.
Hereinafter, the direction in which the medium is sent may be referred to as "downstream", and the opposite direction may be referred to as "upstream". In addition, in FIGS. 1 and 2, the medium transport path is indicated by dashed lines. In the printer 1, media are conveyed through a medium conveying path indicated by dashed lines in FIGS.

The F-axis direction is between a line head 51 and a transport belt 13, which will be described later, that is, the medium transport direction in the recording area. . The V-axis direction is a direction perpendicular to the F-axis direction, and is the movement direction of the head unit 50, which will be described later. Of the V-axis directions, the +V direction is the direction in which the head unit 50 retreats from the recording transport path T1. , -V direction is the direction in which the head unit 50 faces the recording transport path T1.
In some drawings, instead of the XYZ coordinate system, an FVY coordinate system may be used.

A medium transport path in the printer 1 will be described below with reference to FIG. The printer 1 is configured so that an extension unit 6 can be connected to the lower part of the device main body 2, and FIGS. 1 and 2 show the state in which the extension unit 6 is connected.
The device main body 2 has a first medium cassette 3 that stores media in the lower portion thereof, and when an extension unit 6 is connected, a second medium cassette 4 and a third medium cassette 5 are further provided below it.

Each medium cassette is provided with a pick roller that feeds the accommodated medium in the -X direction. Pick rollers 21, 22, and 23 are pick rollers provided for the first medium cassette 3, the second medium cassette 4, and the third medium cassette 5, respectively.
Each medium cassette is provided with a feed roller pair that feeds the medium fed in the -X direction obliquely upward. Feed roller pairs 25, 26, and 27 are feed roller pairs provided for the first medium cassette 3, the second medium cassette 4, and the third medium cassette 5, respectively.
In the following description, unless otherwise specified, the "roller pair" is composed of a drive roller driven by a motor (not shown) and a driven roller rotating in contact with the drive roller.

The medium sent out from the third medium cassette 5 is sent to the transport roller pair 38 by the transport roller pairs 29 and 28 . Also, the medium sent out from the second medium cassette 4 is sent to the transport roller pair 38 by the transport roller pair 28 . The medium is nipped by transport roller pair 38 and sent to transport roller pair 31 .
The medium sent out from the first medium cassette 3 is sent to the transport roller pair 31 by the feed roller pair 25 without passing through the transport roller pair 38 .
Note that the supply roller 19 and the separation roller 20 provided near the transport roller pair 38 are a roller pair that feeds the medium from a supply tray (not shown in FIGS. 1 and 2).

The medium that receives the feeding force from the conveying roller pair 31 is conveyed to a position between the line head 51 , which is an example of a recording head, and the conveying belt 13 , that is, to a position facing the line head 51 . Note that the medium transport path from the transport roller pair 31 to the transport roller pair 32 is hereinafter referred to as a recording transport path T1.

The line head 51 constitutes the head unit 50 . The line head 51 executes printing by ejecting ink, which is an example of liquid, onto the surface of the medium. The line head 51 is an ink ejection head configured so that ink ejection nozzles cover the entire area in the width direction of the medium. configured as a head. However, the ink ejection head is not limited to this, and may be of a type that is mounted on a carriage and ejects ink while moving in the medium width direction.

The head unit 50 is provided so as to be able to move forward and backward with respect to the transport path T1 during recording, and moves between a recording position where it advances to the transport path T1 during recording to perform recording on a medium and a retreat position where it retreats from the transport path T1 during recording. provided as possible.
FIG. 1 shows the state where the head unit 50 is at the recording position, and recording is performed on the medium in this state. FIG. 2 shows a state in which the head unit 50 is at the retracted position. 2 shows the position of the head unit 50 when wiping the ink discharge surface 51a of the line head 51. As shown in FIG.

Here, the range of movement of the head unit 50 will be described with reference to FIG. FIG. 9 schematically shows the movement range of the head unit 50. As shown in FIG. 9, the position of the head unit 50 in the V-axis direction is based on the V-axis direction position of the ink ejection surface 51a.
A position V1 in FIG. 9 is a position where the head unit 50 is most advanced to the recording transport path T1, which is an example of a recording position and corresponds to the position of the head unit 50 shown in FIG. The recording position, that is, the gap between the ink ejection surface 51a and the conveying belt 13 (hereinafter referred to as "PG") can be adjusted by an adjusting cam 80, which will be described later. position. In FIG. 9, illustration of the line head 51 at the position V1b is omitted. Recording is performed on the medium when the head unit 50 is at position V1, or at position V1b, or between positions V1 and V1b.

A position V4 is a position where the head unit 50 is farthest in the +V direction from the recording transport path T1, and is an example of a retreat position. When the head unit 50 is at the position V4, the head unit 50 can be attached and detached. Attachment and detachment of the head unit 50 will be explained later.

A position V2 is a position for wiping the ink ejection surface 51a of the line head 51, and is an example of a retreat position. FIG. 2 shows the state where the head unit 50 is at the position V2. In FIG. 2 , reference numeral 43 denotes a wiper unit, and reference numeral 44 denotes a wiper provided in the wiper unit 43 . The wiper 44 is made of an elastic material such as rubber or elastomer, and can press against the ink ejection surface 51a due to its elasticity.
The wiper unit 43 is provided so as to be movable in the Y-axis direction, which is the direction along the ink ejection surface 51a, by a motor (not shown). Except for the home position. The ink ejection surface 51a is wiped by the wiper 44 by moving the wiper unit 43 in the Y-axis direction.
A position V3 in FIG. 9 is a position where the ink ejection surface 51a is capped with a cap (not shown), and is an example of a retracted position. The position V3b is a position where a cap (not shown) is flushed, that is, ink is discharged from all the ink discharge nozzles (not shown) of the line head 51, and is an example of a retreat position. In FIG. 9, illustration of the line head 51 at the position V3b is omitted.

Returning to FIGS. 1 and 2, reference numerals 10A, 10B, 10C, and 10D denote ink containing portions as liquid containing portions. Ink ejected from the line head 51 is supplied to the line head 51 from each ink container through a tube (not shown). The ink containing portions 10A, 10B, 10C, and 10D are provided detachably with respect to the mounting portions 11A, 11B, 11C, and 11D, respectively.
Further, reference numeral 12 denotes a waste liquid storage section that stores ink as waste liquid ejected from the line head 51 toward a flushing cap (not shown) for maintenance.

The conveyor belt 13 is an endless belt that is looped around the pulleys 14 and 15, and rotates when at least one of the pulleys 14 and 15 is driven by a motor (not shown). The medium is conveyed at a position facing the line head 51 while being attracted to the belt surface of the conveying belt 13 . A known attraction method such as an air suction method or an electrostatic attraction method can be used for attracting the medium to the conveying belt 13 .

Here, the recording transport path T1 passing through the position facing the line head 51 intersects both the horizontal direction and the vertical direction, and is configured to transport the medium upward. As a result, the V-axis direction, which is the movement direction of the head unit 50, also intersects both the horizontal direction and the vertical direction, and the inclination angle α of the V-axis direction with respect to the horizontal direction is smaller than 45°. is approximately 15°.
With such a configuration, it is possible to balance the size of the space required for moving the head unit 50 in the horizontal and vertical directions, and to prevent the device from becoming extremely large in the horizontal and vertical directions. .
Note that the V-axis direction may be parallel to the horizontal direction without being limited to the above configuration.

A discharge tray 8 that forms a support surface 8b for supporting the medium discharged from the medium transport path is provided above the head unit 50 . The support surface 8b extends along the V-axis direction, which is the direction in which the head unit 50 moves. As a result, no wasted space is formed in the relationship between the discharge tray 8 and the movement area of the head unit 50, and the size of the apparatus can be suppressed.
In addition, since a part of the head unit 50 overlaps the ink containing portions 10A to 10D in the Z-axis direction, the size of the device in the Z-axis direction can be suppressed.

Next, the medium on which the recording is performed on the first side by the line head 51 is further sent upward by the conveying roller pair 32 located downstream of the conveying belt 13 .
A flap 41 is provided downstream of the transport roller pair 32, and the flap 41 switches the transport direction of the medium. When the medium is ejected as it is, the transport path of the medium is switched by the flap 41 so as to move toward the upper transport roller pair 35 , and the medium is ejected toward the ejection tray 8 by the transport roller pair 35 .

When recording is performed on the second surface of the medium in addition to the first surface, the transport direction of the medium is directed to the branch position K1 by the flap 41 . The medium then passes through the branch position K1 and enters the switchback path T2. In this embodiment, the switchback path T2 is the medium transport path above the branch position K1. A transport roller pair 36, 37 is provided on the switchback path T2. The medium entering the switchback path T2 is conveyed upward by the conveying roller pair 36, 37, and when the lower edge of the medium passes through the branch position K1, the rotating direction of the conveying roller pair 36, 37 is switched. The medium is conveyed downward by .

An inversion path T3 is connected to the switchback path T2. In this embodiment, the reversing path T3 is a medium transport path from the branch position K1 to the transport roller pair 38 through the transport roller pairs 33 and 34 .
The medium conveyed downward from the branch position K<b>1 receives the feeding force from the conveying roller pairs 33 and 34 , reaches the conveying roller pair 38 , is curved and reversed, and is conveyed to the conveying roller pair 31 .

The medium sent to the position facing the line head 51 again faces the line head 51 on the second side opposite to the first side on which recording has already been performed. This enables recording by the line head 51 on the second surface of the medium.

Next, the moving mechanism 60 that moves the head unit 50 along the V-axis direction will be described.
The moving mechanism 60 includes a right guide member 61A, a left second guide member 61B-2, a second member 63 and a first pinion 65 shown in FIGS. 4 and 5, a third rack forming member 64 shown in FIG. Two pinions 67 are provided, and the first pinion 65 applies an external force in the moving direction to the second rack forming member 62 constituting the head unit 50 .
The second rack forming member 62 is an example of a displacement member, and constitutes the head unit 50 together with the unit main body 50a. The head unit 50 includes a unit main body 50 a having a line head 51 and a second rack forming member 62 .
The second rack forming member 62 and the unit main body 50a are relatively displaceable along the V-axis direction, which will be explained later.

A left first guide member 61B-1 shown in FIG. 8 is provided in the -V direction with respect to the left second guide member 61B-2. Hereinafter, the right guide member 61A, the first left guide member 61B-1, and the second left guide member 61B-2 may be collectively referred to as the "guide member 61" when there is no need to distinguish them.
The guide member 61 is fixedly provided with respect to the frame (not shown) of the apparatus.

First, the configuration for guiding the head unit 50 in the V-axis direction will be described below.
A second guided roller 52B and a third guided roller 52C are provided as shown in FIG. ing. The second guided roller 52B and the third guided roller 52C are each provided on a shaft 49 projecting in the -Y direction. The second guided roller 52B and the third guided roller 52C are bearings that are freely rotatable about the shaft 49 . The second guided roller 52B and the third guided roller 52C are spaced apart along the V-axis direction, and the second guided roller 52B is positioned in the -V direction with respect to the third guided roller 52C. ing.
The second guided roller 52B is an example of a second guided portion, and the third guided roller 52C is an example of a third guided portion.

In addition, as shown in FIG. 6, the side portion of the head unit 50 in the +Y direction in the Y-axis direction, ie, the side portion facing the left first guide member 61B-1 and the left second guide member 61B-2, is provided with a first guided member. A roller 52A and a fourth guided roller 52D are provided. 6, illustration of the moving mechanism 60 shown in FIG. 3 is omitted, and only the head unit 50 is shown.
The first guided roller 52A and the fourth guided roller 52D are provided on shafts 49 projecting in the +Y direction. The first guided roller 52A and the fourth guided roller 52D are bearings that are freely rotatable about the shaft 49 . The first guided roller 52A and the fourth guided roller 52D are spaced apart along the V-axis direction, and the first guided roller 52A is positioned in the -V direction with respect to the fourth guided roller 52D. ing.
The first guided roller 52A is an example of a first guided portion.

As shown in FIG. 7, a right first guide groove 61b is formed along the V-axis direction in the right guide member 61A arranged to face the side portion of the head unit 50 in the -Y direction. The second guided roller 52B and the third guided roller 52C provided on the side of the head unit 50 in the -Y direction enter the right first guide groove 61b. The side portion is guided in the V-axis direction by the right first guide groove 61b.
Reference numeral S2 denotes a lower surface of the right first guide groove 61b, which is hereinafter referred to as a second guide surface. The second guided roller 52B and the third guided roller 52C are supported by the second guide surface S2 and receive reaction force from the second guide surface S2.

The normal force that the second guided roller 52B receives from the second guide surface S2 is indicated by an arrow labeled H2 in FIG. Further, the normal force that the third guided roller 52C receives from the second guide surface S2 is indicated by an arrow with a symbol H3 in FIG. In addition, the arrow labeled W2 in FIG. It is the force with which the third guided roller 52C contacts the second guide surface S2 perpendicularly due to its own weight.
The vertical forces H2 and H3 and the forces W2 and W3 both decrease as the inclination angle α between the V-axis direction and the horizontal direction increases.

Next, as shown in FIG. 8, the left first guide member 61B-1 and the left second guide member 61B-2 arranged to face the side portion of the head unit 50 in the +Y direction are provided with left guide members along the V-axis direction. A first guide groove 61d is formed. The first left guide member 61B-1 is positioned in the -V direction with respect to the second left guide member 61B-2, and the first left guide member 61B-1 and the second left guide member 61B-2 are positioned in the V-axis direction. are provided at intervals G1. Therefore, the left first guide groove 61d is divided within the range of the interval G1. In FIG. 8, the left first guide groove formed in the left first guide member 61B-1 is denoted by reference numeral 61d-1, and the left first guide groove formed in the left second guide member 61B-2 is denoted by reference numeral 61d-1. 61d-2 is attached. However, hereinafter, these may be collectively referred to as the left first guide groove 61d.
The gap G1 is a gap for the wiper unit 43 described with reference to FIG. 2 to move in the Y-axis direction through between the left first guide member 61B-1 and the left second guide member 61B-2. .

The first guided roller 52A and the fourth guided roller 52D provided on the +Y direction side portion of the head unit 50 enter the left first guide groove 61d, thereby causing the +Y direction side portion of the head unit 50 to It is guided in the V-axis direction by the left first guide groove 61d.
Reference numeral S1-1 denotes the lower surface of the left first guide groove 61d-1. Reference numeral S1-2 denotes the lower surface of the left first guide groove 61d-2. The surfaces S1-1 and S1-2 are hereinafter referred to as first guide surfaces. The first guide surfaces S1-1 and S1-2 are surfaces parallel to the second guide surface S2.
The first guided roller 52A and the fourth guided roller 52D are supported by the first guide surface S1-1 or the first guide surface S1-2, and the first guide surface S1-1 or the first guide surface S1-2. receives a reaction force from

Here, FIG. 8 shows the state in which the head unit 50 is in the recording position, and in this state, as shown in the figure, the first guided roller 52A is inside the left first guide groove 61d-1 and is the first guide groove 61d-1. Although it is supported by the surface S1-1, the fourth guided roller 52D is inside the gap G1 and is not supported by either of the first guide surfaces S1-1 and S1-2.

Therefore, when the head unit 50 is in the recording position, the head unit 50 is supported at one point of the first guided roller 52A on the +Y direction side, and is supported by the second guided roller 52B and the third guided roller 52B on the -Y direction side. It is supported at two points of the guided roller 52C, and is supported at a total of three points.
As is clear from FIG. 8, when the head unit 50 moves from the recording position toward the retracted position, the first guided roller 52A and the fourth guided roller 52D enter the left first guide groove 61d-2, It is supported by the first guide surface S1-2.
Since the gap G1 is smaller than the gap in the V-axis direction between the first guided roller 52A and the fourth guided roller 52D, the head unit 50 is positioned between the first guided roller 52A and the fourth guided roller 52D at the +Y direction side portions. are supported by the first guide surface S1-1 or the first guide surface S1-2.

A third guide groove 61j and a fourth guide groove 61k are formed in the left second guide member 61B-2 along a direction crossing the left first guide groove 61d. When the head unit 50 moves to the most retracted position in the +V direction, the first guided roller 52A faces the third guide groove 61j, and the fourth guided roller 52D faces the fourth guide groove 61k. In this state, the first guided roller 52A can move upward along the third guide groove 61j, and the fourth guided roller 52D can move upward along the fourth guide groove 61k. can.

Similarly, the right guide member 61A described with reference to FIG. 7 is also formed with a third guide groove 61j and a fourth guide groove 61k along a direction crossing the right first guide groove 61b. When the head unit 50 moves to the most retracted position in the +V direction, the second guided roller 52B faces the third guide groove 61j, and the third guided roller 52C faces the fourth guide groove 61k. In this state, the second guided roller 52B can move upward along the third guide groove 61j, and the third guided roller 52C can move upward along the fourth guide groove 61k. can.

Although the third guide groove 61j and the fourth guide groove 61k form a slight angle with respect to the F-axis direction, they are generally formed along the F-axis direction.
As described above, when the head unit 50 is moved to the retracted position in the +V direction, the head unit 50 can be removed upward. Further, the head unit 50 can be attached to the apparatus main body 2 by performing a procedure inverse to the removal. The third guide groove 61j and the fourth guide groove 61k function as guide portions that guide the head unit 50 in the attachment/detachment direction.
Since the head unit 50 is detachable from the apparatus main body 2 in this manner, maintenance and replacement of the head unit 50 are facilitated.

Next, as shown in FIGS. 4 and 5, the guide member 61 has a first rack 61a formed along the V-axis direction on the side facing the head unit 50. As shown in FIG.
A second rack forming member 62 is provided at both ends of the head unit 50 in the Y-axis direction, and a second rack 62a is formed in the second rack forming member 62 along the V-axis direction. The first rack 61a and the second rack 62a face each other, the first pinion 65 is arranged between the first rack 61a and the second rack 62a, and both the first rack 61a and the second rack 62a The first pinion 65 is meshed.
The teeth of the first rack 61a, the second rack 62a, and the first pinion 65 all extend along the F-axis direction, which is a direction orthogonal to the moving direction of the head unit 50. As shown in FIG.

The first pinion 65 is rotatably provided on the second member 63 . Lower roller support members 54 are provided on both sides of the second member 63 in the Y-axis direction as shown in FIG. provided at intervals. The lower roller 53 is a driven roller that is freely rotatably supported by a lower roller support member 54 .

The two lower rollers 53 provided on the side of the head unit 50 in the -Y direction enter the right second guide groove 61c formed along the V-axis direction in the right guide member 61A as shown in FIG. It is guided in the V-axis direction by the right second guide groove 61c.
The two lower rollers 53 provided on the side of the head unit 50 in the +Y direction are arranged in the second left guide groove formed along the V-axis direction in the second left guide member 61B-2 as shown in FIG. 61e and is guided in the V-axis direction by the left second guide groove 61e.

As shown in FIG. 3, a third rack forming member 64 is provided below the second member 63, and a third rack 64a is provided below the third rack forming member 64 along the V-axis direction. formed. The tooth width direction of the third rack 64a is along the Y-axis direction. A second pinion 67 meshes with the third rack 64a.
The third rack forming members 64 are provided at both ends in the Y-axis direction on the lower side of the second member 63 . The second pinion 67 is provided at a position facing the third rack 64a on a rotating shaft 68 having a rotating shaft center parallel to the Y-axis direction. is configured as The power of the motor 59 is transmitted to the rotary shaft 68 via a gear mechanism (not shown in FIG. 3).

Reference numeral 58 in FIG. 3 denotes a control section for controlling the motor 59 . The control unit 58 can grasp the position of the head unit 50 in the V-axis direction based on a signal received from a reference position sensor (not shown) and the drive amount of the motor 59 .

In the above configuration, when the second pinion 67 is rotated by the power of the motor 59, the second member 63 moves along the V-axis direction. Here, since the guide member 61 shown in FIGS. 4 and 5, i.e., the first rack 61a, is provided fixedly, the first pinion 65 provided on the second member 63 that moves in the V-axis direction can be It rotates based on engagement with 61a.
Since the first pinion 65 meshes with the second rack 62a provided on the head unit 50, the rotation of the first pinion 65 causes the head unit 50 to be pushed out in the V-axis direction.

For example, when the head unit 50 is in the recording position shown in FIG. 4, when the second member 63 is moved in the +V direction by the power of the motor 59, the right first pinion 65 in FIG. , and the first pinion 65 on the left side in FIG. 4 rotates clockwise in FIG. As a result, the head unit 50 is moved in the +V direction.
When the second member 63 is moved in the -V direction by the power of the motor 59 while the head unit 50 is in the retracted position shown in FIG. 5, the right first pinion 65 in FIG. 5, the first pinion 65 on the left side of FIG. 5 rotates counterclockwise in FIG. As a result, the head unit 50 is moved in the -V direction.

Strictly speaking, the head unit 50 has a force to move in the -V direction due to the action of gravity. This is because the -V direction includes a -Z direction component. Therefore, when the head unit 50 moves in the -V direction, the movement mechanism 60 applies a force in the +V direction to the head unit 50, thereby restricting the movement of the head unit 50 in the -V direction due to the action of gravity. . However, after the head unit 50 comes into contact with an adjusting cam 80 (see FIG. 10), which will be described later, the moving mechanism 60 applies a force in the -V direction to the head unit 50, which will be explained later.
When the head unit 50 moves in the +V direction, the moving mechanism 60 applies force in the +V direction to the head unit 50 .

Here, the range in the V-axis direction indicated by symbol M1 in FIGS. 4 and 5 is the range of movement of the second member 63 with the rotation axis center of the first pinion 65 as a reference. 4 and 5, the range in the V-axis direction indicated by symbol M2 is the movement range of the head unit 50 with reference to the -V-direction end position of the second rack forming member 62. As shown in FIG.
As described above, the head unit 50 is moved in the V-axis direction by the rotation of the first pinion 65. Since the first pinion 65 itself is configured to move in the V-axis direction, the movement range M1 of the second member 63 is , the moving range M2 of the head unit 50 becomes larger. In this embodiment, the movement range M2 is about twice as large as the movement range M1.

As described above, the moving mechanism 60 includes the guide member 61 formed with the first rack 61a along the moving direction of the head unit 50, the first pinion 65 meshing with the first rack 61a, and the head unit 50 having the first rack 61a. 61a and formed along the V-axis direction, which is the movement direction of the head unit 50. The second rack 62a meshing with the first pinion 65 and the first pinion 65 are rotatable. and a second member 63 that is movable in the V-axis direction by receiving the power of the motor 59 . By rotating the first pinion 65 moving in the V-axis direction, the amount of movement of the head unit 50 becomes larger than the amount of movement of the second member 63 . In other words, since the amount of movement of the head unit 50 can be secured while the amount of movement of the second member 63 is suppressed, the mechanism for moving the second member 63 can be prevented from increasing in size. The length of the third rack 64a in the V-axis direction can be suppressed. As a result, the enlargement of the printer 1 can be suppressed.

Further, since the moving mechanism 60 is provided on both sides of the head unit 50 in the Y-axis direction, the amount of movement in the V-axis direction can be made equal between one end side and the other end side of the head unit 50 in the Y-axis direction. As a result, the head unit 50 can be moved in the V-axis direction while maintaining the posture of the head unit 50 appropriately.

The tooth width direction of the first rack 61a, the second rack 62a, and the first pinion 65 is along the F-axis direction, and the F-axis direction is substantially along the attaching/detaching direction of the head unit 50. FIG. Accordingly, when the head unit 50 is attached and detached, the meshing of the first rack 61a, the second rack 62a, and the first pinion 65 does not interfere, and the head unit 50 can be easily attached and detached.
In addition, even if the first pinion 65 vibrates in the tooth width direction when the second member 63 moves, the vibration is less likely to be transmitted to the second rack 62a, that is, the head unit 50, and the head unit 50 can be protected from vibration. , the failure of the head unit 50 can be suppressed.
The tooth width direction of the first rack 61a, the second rack 62a, and the first pinion 65 is along the F-axis direction, and in this embodiment, is slightly angled with respect to the attachment/detachment direction of the head unit 50. However, it may be parallel to the attachment/detachment direction of the head unit 50 .

Further, as shown in FIG. 3, a plurality of third racks 64a and second pinions 67 are provided in the Y-axis direction. be able to. As a result, the head unit 50 can be moved while maintaining the posture of the head unit 50 appropriately.

Next, the configuration of the head unit 50 will be further described.
As described above, the head unit 50 includes the unit body 50a including the line head 51 and the second rack forming member 62, which is an example of a displacement member.
The unit main body 50a has engagement pins 50d (see FIG. 10) on both sides in the Y-axis direction as portions that engage with the second rack forming member 62. As shown in FIG. Two engaging pins 50d are provided on both sides of the unit main body 50a in the Y-axis direction, spaced apart in the V-axis direction. Two guide holes 62b extending in the V-axis direction are provided in the second rack forming member 62 at intervals along the V-axis direction. and the second rack forming member 62 are connected to each other and relatively displaceable along the V-axis direction.

A spring 55, which is an example of a pressing member, is provided between the unit main body 50a and the second rack forming member 62 (see also FIG. 6). Spring 55 is a compression coil spring in this embodiment. However, the spring 55 is not limited to a compression coil spring, but a tension coil spring or a torsion coil spring, as long as it can exert a force F3 (see FIG. 11) between the unit main body 50a and the second rack forming member 62, which will be described later. etc.
In FIG. 10, reference numeral 50c denotes a spring receiving portion provided on the unit main body 50a, and reference numeral 62c denotes a spring receiving portion provided on the second rack forming member 62. As shown in FIG. The spring 55 exerts a pressing force between the spring receiving portion 50c and the spring receiving portion 62c, and this pressing force acts to separate the spring receiving portion 50c and the spring receiving portion 62c.

When the head unit 50 is not in contact with an adjustment cam 80, which will be described later, the spring 55 is in the most stretched state between the spring receiving portion 50c and the spring receiving portion 62c, and the engaging pin 50d is positioned at the guide hole 62b at - Located in the V direction.

Next, an adjustment cam 80 is provided in the -V direction with respect to the head unit 50 . The adjustment cam 80 is rotatably provided around an eccentric shaft 81 by receiving power from a motor (not shown). The adjustment cams 80 are provided on both sides of the head unit 50 in the Y-axis direction as shown in FIG. In FIG. 12, the adjusting cam 80 is hatched for convenience of illustration.
The head unit 50 is provided with a cam contact surface 50b that contacts the adjusting cam 80. As shown in FIG. The cam contact surfaces 50b are also provided on both sides of the head unit 50 in the Y-axis direction as shown in FIG.

The recording position of the head unit 50 is defined when the cam contact surface 50 b contacts the adjustment cam 80 . That is, the adjustment cam 80 abuts on a portion of the head unit 50 moving from the retracted position toward the recording position, and functions as a positioning portion that defines the position of the head unit 50 at the recording position.
Since the adjusting cam 80 rotates about the eccentric shaft 81, the position of the cam contact surface 50b in the V-axis direction can be adjusted by rotating the adjusting cam 80, that is, the recording position can be adjusted. can. The recording position is adjusted according to the thickness of the recording medium, for example.

When driving the motor 59 to move the head unit 50 to the recording position, the control unit 58 (see FIG. 3) further drives the motor 59 from the state in which the cam contact surface 50b is in contact with the adjustment cam 80 to move the head unit 50 to the recording position. 2 The rack forming member 62 is moved in the -V direction. At this time, since the cam contact surface 50b of the unit body 50a is in contact with the adjusting cam 80 and does not move in the -V direction, only the second rack forming member 62 is moved as shown by the change from FIG. 10 to FIG. - Move in the V direction. Due to such relative movement between the unit body 50a and the second rack forming member 62, the spring 55 is contracted and exerts a force F3 shown in FIG. 11 on the unit body 50a.

In this manner, the head unit 50 includes the unit body 50a including the line head 51, the second rack forming member 62 that is relatively displaceable along the movement direction of the head unit 50 with respect to the unit body 50a, and the unit body 50a. A spring 55 interposed between the head unit 50 and the second rack forming member 62 and serving as a pressing member that presses the unit body 50a toward the adjustment cam 80 when the head unit 50 is in the recording position. It is configured to apply a force for moving the head unit 50 to the second rack forming member 62 . As a result, when the head unit 50 is moved toward the recording position by the moving mechanism 60 and stopped with the unit main body 50a in contact with the adjustment cam 80, high stopping accuracy is not required. Position control becomes easier.

In the state shown in FIG. 11, the first pinion 65 applies a −V direction force F1 to the second rack forming member 62 . In order to maintain this state, the control unit 58 (see FIG. 3) may perform hold control of the motor 59 .
Also, in this state, the unit main body 50a receives a reaction force F2 in the +V direction from the adjustment cam 80 at the position of the cam contact surface 50b.
Since the direction of the force F1 and the direction of the reaction force F2 are opposite to each other and the acting positions are distant, a moment Ma is generated in the head unit 50 to rotate counterclockwise in FIG.
The force F1 and the reaction force F2 both act on the +Y direction side portion and the -Y direction side portion. The magnitude of the force F1 acting on the side is almost the same, and the magnitude of the reaction force F2 acting on the side in the +Y direction is almost the same as the magnitude of the reaction force F2 acting on the side in the -Y direction. Therefore, the moment Ma is also generated with substantially the same magnitude on the +Y direction side and the -Y direction side.

This moment Ma acts on the third guided roller 52C as a pressing force R3 that presses it against the second guide surface S2, and acts on the second guided roller 52B as a lifting force R2 that lifts the second guided roller 52B from the second guide surface S2. do.
The pressing force R3 promotes the force W3 with which the third guided roller 52C comes into contact with the second guide surface S2 due to the weight of the head unit 50, so the third guided roller 52C does not rise from the second guide surface S2. On the other hand, the lifting force R2 acts to cancel the force W2 with which the second guided roller 52B comes into contact with the second guide surface S2 due to the weight of the head unit 50. Therefore, when the lifting force R2 overcomes the force W2, the second The guided roller 52B rises from the second guide surface S2. As a result, the posture of the head unit 50 becomes inappropriate, which may adversely affect the recording quality.
Since the head unit 50 is supported at one point of the first guided roller 52A on the +Y direction side, the first guided roller 52A does not rise from the first guide surface S1-1. Since it is in a state where it is easy to rotate around the guided roller 52A as a fulcrum, the posture becomes unstable due to the influence of the moment Ma.

Note that the moment Ma increases as the force F1 increases. Also, the moment Ma increases as the force F3 increases. Also, the moment Ma increases as the position of action of the force F1 and the position of action of the reaction force F2 are separated in the F-axis direction.
In this embodiment, the force F3 by the spring 55 is adjusted so that the lifting force R2 does not overcome the force W2.

The effects of the printer 1 configured as described above will be described below. As shown in FIG. 11, the tooth width direction of the second rack 62a and the first pinion 65 is the direction along the F-axis direction, which is the normal direction of the second guide surface S2. This makes it difficult for the force F1 applied by the first pinion 65 to the second rack 62a to lift the head unit 50 from the second guide surface S2 and the first guide surfaces S1-1 and S1-2. The posture of the unit 50 is stabilized.
In addition, when the head unit 50 is removed in the +F direction, the first pinion 65 is less likely to be a hindrance, and a decrease in the workability of attaching and detaching the head unit 50 can be suppressed.
The tooth width direction of the second rack 62a and the first pinion 65 strictly coincides with the F-axis direction, which is the normal direction of the second guide surface S2 and the first guide surfaces S1-1 and S1-2. However, the head unit 50 may be slightly angled with respect to the F-axis direction as long as the head unit 50 is not lifted from the second guide surface S2 and the first guide surfaces S1-1 and S1-2. do not have.

In this embodiment, the V-axis direction, which is the moving direction of the head unit 50, is a direction that intersects both the horizontal direction and the vertical direction. The reaction force received from the guide surface S2 and the first guide surfaces S1-1 and S1-2 is reduced, and the posture of the head unit 50 tends to become unstable. Since the force F1 that acts on the head unit 50 hardly acts to push up the head unit 50, the posture of the head unit 50 is stabilized.
In this embodiment, the V-axis direction, which is the movement direction of the head unit 50, is a direction that intersects both the horizontal direction and the vertical direction, but it may be along the horizontal direction.

The head unit 50 includes a unit main body 50a that includes a line head 51 and contacts the adjusting cam 80, and a second rack forming member 62 that is displaceable relative to the unit main body 50a along the moving direction of the head unit 50. , and a spring 55 interposed between the unit main body 50a and the second rack forming member 62 to press the unit main body 50a toward the adjusting cam 80 when the head unit 50 is at the recording position. Accordingly, when the head unit 50 is moved toward the recording position and stopped with the unit main body 50a in contact with the adjustment cam 80, high stopping accuracy is not required, and the position control of the head unit 50 is facilitated. Become.

In addition, the head unit 50 includes a first guided roller 52A at one end in the Y-axis direction (+Y direction end), and the head unit 50 at the other end in the Y-axis direction (−Y direction end). A second guided roller 52B and a third guided roller 52C are provided spaced apart in the moving direction of . The first guided roller 52A is guided in the movement direction while being supported by first guide surfaces S1-1 and S1-2 (see FIG. 8) extending along the movement direction of the head unit 50, and the second guided roller 52B The third guided roller 52C is guided in the movement direction while being supported by the second guide surface S2 (see FIG. 7) extending along the movement direction. Then, the head unit 50 is supported at three points, the first guided roller 52A, the second guided roller 52B, and the third guided roller 52C, at least in the recording position. As a result, the posture of the head unit 50 at the recording position is stabilized, and good recording quality can be obtained.

In FIG. 12, reference numeral Q1 denotes a first position where the first guided roller 52A contacts the first guide surface S1-1, and reference numeral Q2 denotes a second position where the second guided roller 52B contacts the second guide surface S2. Position Q3 is the third position where the third guided roller 52C is in contact with the second guide surface S2.
Reference character Q5 is the center-of-gravity position of the head unit 50 when viewed from the direction (+F direction) perpendicular to the plane including the first position Q1, the second position Q2, and the third position Q3. The center-of-gravity position Q5 is inside a triangular area At connecting the first position Q1, the second position Q2, and the third position Q3. This stabilizes the posture of the head unit 50 .
The center-of-gravity position Q5 may be located inside the area At when viewed from the +F direction, and may be located at a position different from the area At when viewed from the Y direction. In this embodiment, the center-of-gravity position Q5 is located on the +F direction side with respect to the area At when viewed from the Y direction.

Next, another embodiment of the head unit will be described. Duplicate descriptions of configurations that are the same as those already described in the embodiments described below shall be avoided.
In the head unit 50A shown in FIG. 13, the cam contact surface 50b is moved in the -F direction as compared with the embodiment described above. As a result, a straight line Lu parallel to the V-axis direction, which is the moving direction of the head unit 50A when viewed from the Y-axis direction, passes through the first pinion 65 and the adjustment cam 80 . As a result, a position where the first pinion 65 applies an external force to the second rack 62a, i.e., the position where the force F1 acts, and a position where the unit main body 50a receives the reaction force from the adjustment cam 80, i.e., the position where the reaction force F2 acts. , the moment Ma shown in FIG. 11 becomes smaller or almost disappears, so that the posture of the head unit 50 is stabilized.
In this embodiment, the cam contact surface 50b and the adjustment cam 80 are moved in the -F direction in comparison with the configuration shown in FIG. You can move it in any direction.

Next, still another embodiment of the head unit will be described with reference to FIG. A head unit 50B shown in FIG. 14 is provided in a state in which the spring 55 is inclined with respect to the V-axis direction in comparison with the above-described embodiment. It is configured to act so as to press the second guided roller 52B, which is a part of 50a, against the second guide surface S2.
More specifically, the second rack forming member 62A has a guided portion 62f extending along the V-axis direction. A guide groove 63a is formed in the second member 63 (see FIG. 3) along the V-axis direction. It is configured to be guided by the member 63 .

A groove outlet 63b is formed at the +V direction end of the guide groove 63a so that the guided portion 62f can escape from the groove outlet 63b in the +V direction. The position of the head unit 50 when the guided portion 62f exits the groove outlet 63b in the +V direction is position V4 shown in FIG. By pulling out in the +V direction, the second rack forming member 62A and the unit main body 50a can be removed integrally.

The unit main body 50a is provided with an engaging pin 50d, and this engaging pin 50d is inserted into a guide hole 62e formed in the second rack forming member 62A. This guide hole 62e is enlarged in the F-axis direction, unlike the guide hole 62b described with reference to FIG.
As described above, the guided portion 62f, which is a part of the second rack forming member 62A, is inserted into the guide groove 63a. Since the guide hole 62e is enlarged so as not to contact, the moment generated in the second rack forming member 62A by the force F1 does not act on the unit main body 50a.
Moreover, the spring 55 is provided in a state inclined with respect to the V-axis direction, and the force F3 with which the spring 55 presses the unit main body 50a pushes the second guided roller 52B, which is a part of the unit main body 50a, to the second guided roller 52B. Since the second guided roller 52B is configured to press against the second guide surface S2, it becomes difficult for the second guided roller 52B to rise from the second guide surface S2, and the posture of the head unit 50 is stabilized.

Furthermore, the present invention is not limited to the embodiments and modifications described above, and various modifications are possible within the scope of the invention described in the claims, which are also included in the scope of the invention. It goes without saying that

DESCRIPTION OF SYMBOLS 1... Inkjet printer, 2... Apparatus main body, 3... 1st medium cassette, 4... 2nd medium cassette, 5... 3rd medium cassette, 6... Extension unit, 8... Ejection tray, 8a... Protruding part, 8b... Support surface , 9... Scanner unit 10A, 10B, 10C, 10D... Ink container 11A, 11B, 11C, 11D... Mounting part 12... Waste liquid container 13... Conveyor belt 14, 15... Pulley 19... Supply roller , 20... separation rollers, 21, 22, 23... pick rollers, 25, 26, 27... feed roller pairs, 28, 29, 31, 32, 33, 34, 35, 36, 37, 38... transport roller pairs, 41 Flap 43 Wiper unit 44 Wiper 49 Shaft 50, 50A, 50B Head unit 50a Unit main body 50b Cam contact surface 50c Spring receiving portion 50d Engaging pin 50e Spring receiving portion 50f Detected portion 51 Line head 51a Ink ejection surface 52A First guided roller 52B Second guided roller 52C Third guided roller 52D Third 4 Guided Rollers 53 Lower Roller 54 Lower Roller Supporting Member 55 Spring 58 Control Unit 59 Motor 60 Moving Mechanism 61A Right Guide Member 61B-1 Left First Guide Member , 61B-2...Left second guide member, 61a...First rack, 61b...Right first guide groove, 61c...Right second guide groove, 61d...Left first guide groove, 61e...Left second guide groove, 61j Third guide groove 61k Fourth guide groove 62, 62A Second rack forming member 62a Second rack 62b Guide hole 62c Spring receiving portion 62d Part to be detected 62e Guide hole , 62f .. Guided portion 63 . Rotation shaft 69 Guide roller 80 Adjusting cam 81 Eccentric shaft S1-1, S1-2 First guide surface S2 Second guide surface T1 Conveyance path during recording T2 Switchback path, T3...reversal path

Claims (7)

a medium transport path for transporting the medium;
a recording head that performs recording on a medium conveyed through the medium conveying path;
a head unit that includes the recording head and is movable between a recording position for recording on a medium and a retraction position for retracting from the medium transport path;
a guide surface that guides the head unit in a movement direction of the head unit;
a moving mechanism that moves the head unit by applying a force to the head unit along a moving direction of the head unit;
a positioning portion that contacts a part of the head unit moving from the retracted position toward the recording position and defines the position of the head unit at the recording position;
and a motor that is a power source of the moving mechanism,
the moving direction of the head unit is a horizontal direction or a direction crossing both the horizontal and vertical directions;
the moving mechanism includes a pinion that meshes with a rack that constitutes the head unit;
The tooth width direction of the rack and the pinion is along the normal direction of the guide surface,
A recording device characterized by: 2. The recording apparatus according to claim 1, wherein the head unit includes a unit body including the recording head and abutting on the positioning portion;
the rack displaceable relative to the unit main body along the moving direction of the head unit;
a pressing member that is interposed between the unit body and the rack and presses the unit body toward the positioning portion when the head unit is in the recording position;
A recording device characterized by: 3. The recording apparatus according to claim 2, wherein a straight line parallel to the moving direction of the head unit passes through the pinion and the positioning portion when viewed from the width direction that intersects the medium conveying direction.
A recording device characterized by: 3. The recording apparatus according to claim 2, wherein said unit body is supported by said guide surface,
part of the rack is in a guide groove extending along the direction of movement of the head unit;
The pressing force with which the pressing member presses the unit body acts to press a part of the unit body against the guide surface,
A recording device characterized by: 5. The recording apparatus according to any one of claims 2 to 4, wherein the unit body includes a first guided portion at one end in a width direction that intersects the medium conveying direction, a second guided portion and a third guided portion spaced apart in the movement direction of the head unit at the other end in the width direction;
The guide surface includes a first guide surface that supports the first guided portion, a second guide surface that supports the second guided portion, and a third guide surface that supports the third guided portion,
The head unit is supported at three points of the first guided portion, the second guided portion, and the third guided portion at least in the recording position,
A recording device characterized by: 6. The recording apparatus according to claim 5, wherein the first position where the first guided portion contacts the first guide surface, the second position where the second guided portion contacts the second guide surface, and the third position where the second guided portion contacts the second guide surface. The position of the center of gravity of the head unit connects the first position, the second position, and the third position when viewed from a direction orthogonal to a plane including a third position where the guided portion contacts the second guide surface. within the triangular area,
A recording device characterized by: 7. The recording apparatus according to any one of claims 1 to 6, wherein the movement direction of the head unit is a direction that intersects both the horizontal direction and the vertical direction.
A recording device characterized by:

Images