JP2015182866A - Roller unit for transportation, attaching/detaching method of roller unit for transportation and liquid discharge device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the stable attaching state between a roller unit and a base body part in a case where the roller unit having a roller rotating while in contact with a transportation object is configured to be attachable/detachable to/from the base body part.SOLUTION: A roller unit for transportation comprises a roller unit 23 which has a roller 15 rotating while in contact with a transportation object P and a base body part 25 to which the roller unit 23 is detachably attached. The roller unit 23 comprises a roller side fulcrum element part 27 and a roller side movement restriction part 29. The base body part 25 comprises a base body side fulcrum element part 31 which is engaged with the roller side fulcrum element part 27 to constitute a fulcrum O and a base body side movement restriction part 33 which is engaged with the roller side movement restriction part 29. The roller unit 23 is moved toward the base body part 25 to engage both fulcrum element parts 27, 31 with each other, rotated with respect to the fulcrum O to engage both movement restriction parts 29, 33 with each other, and attached to the base body part 25.

Description

  A roller unit having a roller that rotates in contact with the conveyed product is configured to be detachable from the base unit, a method for attaching and detaching the roller unit to the base unit, and the transport roller unit. The present invention relates to a liquid ejection apparatus provided.

2. Description of the Related Art A transport roller unit in which a roller unit having a roller that rotates in contact with a transported object is configured to be detachable with respect to a base body is conventionally known as shown in Patent Document 1 below.
Patent Document 1 discloses that a concave portion formed in a holder portion that holds a roller and a shaft portion provided on the base portion side, a leaf spring-like locking tool attached to the holder portion, and the base portion side. The structure which attached the roller unit to the base | substrate part so that attachment or detachment by the latching effect | action of this frame was disclosed.

JP 2006-56642 A

  However, in the said patent document 1, it is the structure in which a leaf | plate spring-shaped latching tool prevents the roller unit from coming off. That is, since the roller unit is attached in an elastically locked state by a leaf spring-shaped locking tool, the roller unit receives a reaction force accompanying the movement of the conveyed object when the roller rotates in contact with the conveyed object. The holding state of the roller unit may become unstable. For this reason, there has been a problem that the roller is inclined and skew is likely to occur in the conveyed product, that is, skew.

  In addition, since the locking position of the locking tool is difficult to visually recognize at the deep position of the frame, the attaching / detaching operation of the roller unit requires skill. That is, it was difficult to attach and detach the roller unit to and from the base portion.

  An object of the present invention is to realize a stable attachment state between a roller unit and a base portion when a roller unit having a roller that rotates in contact with a conveyed product is detachable from the base portion. .

  The transport roller unit according to the first aspect of the present invention transports a transported object including a roller unit having a roller that rotates in contact with the transported object, and a base unit to which the roller unit is detachably attached. The roller unit is provided with a roller side fulcrum element part and a roller side movement restricting part, while the base part is engaged with the roller side fulcrum element part to constitute a fulcrum. A base-side fulcrum element part that engages with the roller-side movement restricting part, and the roller unit moves toward the base part to engage the both fulcrum element parts. The roller unit is rotated with respect to the fulcrum, and the both movement restricting portions are engaged to be attached to the base portion.

  In the transport roller unit according to the second aspect of the present invention, in the first aspect, the engagement direction of the roller side fulcrum element part and the base side fulcrum element part is in a direction along the transport direction of the transported object. It is set, The engagement direction of the said roller side movement control part and the said base | substrate side movement control part is set to the direction which cross | intersects the conveyance direction of a conveyed product, It is characterized by the above-mentioned.

  The transport roller unit according to a third aspect of the present invention is the transport roller unit according to the first aspect or the second aspect, wherein the roller unit includes the roller and a holder portion that holds the roller. A first engagement shaft portion that constitutes the roller side fulcrum element portion, and a first engagement groove portion that constitutes the roller side movement restriction portion, and the base portion side fulcrum element portion is provided on the base portion. And a second engagement groove portion that engages with the first engagement shaft portion and a second engagement shaft portion that constitutes the base-side movement restriction portion and engages with the first engagement groove portion. It is characterized by being.

  The transport roller unit according to a fourth aspect of the present invention is the transport roller unit according to the third aspect, wherein an opening for allowing the second engagement shaft portion to enter the first engagement groove portion and the transport of the conveyed product. A first restriction wall and a second restriction wall for restricting movement of the roller unit in a direction along the direction are provided.

  The transport roller unit according to a fifth aspect of the present invention is the transport roller unit according to the fourth aspect, wherein an opening for allowing the first engagement shaft portion to enter the second engagement groove and a pressing against the transported object are provided. A pressing action wall for transmitting force to the roller and an entry guide wall for guiding the entry of the first engagement shaft portion are provided.

  In the transport roller unit according to the sixth aspect of the present invention, in the fourth aspect or the fifth aspect, the holder portion is brought into contact with the second engagement shaft portion provided in the base portion. Thus, there is provided a guiding guide portion for guiding the opening portion of the first engagement groove portion to the position of the second engagement shaft portion.

  The transport roller unit according to a seventh aspect of the present invention is the transport roller unit according to any one of the fourth to sixth aspects, wherein both the holder part and the base part, A rotation promoting structure for urging the roller unit to rotate so that the second engagement shaft portion positioned at the opening of the first engagement groove portion enters the first engagement groove portion is provided. It is characterized by that.

  The conveying roller unit according to an eighth aspect of the present invention is the conveying roller unit according to any one of the third to seventh aspects, wherein the holder portion includes the first engaging groove portion and the second engaging portion. A connecting portion of a removal tool for transmitting a force in a direction to release the engaged state with the shaft portion to the roller unit is provided.

  According to a ninth aspect of the present invention, there is provided a method for attaching and detaching a transport roller unit comprising: a roller unit including a roller side fulcrum element part and a roller side movement restricting part; a base side fulcrum element part; When attaching and detaching the roller unit to and from the base portion provided, after the roller unit is moved toward the base portion and the fulcrum element portions are engaged to form a fulcrum, When the roller unit is attached by rotating in the engaging direction of the both movement restricting portions around the fulcrum, and the roller unit is removed, the roller unit is attached to the both movement restricting portions around the fulcrum. After releasing the engagement by rotating in the engagement release direction, the roller unit is removed by moving it in a direction away from the base portion. And wherein the door.

A liquid discharge apparatus according to a tenth aspect of the present invention includes a liquid discharge head that discharges a liquid toward a medium, a medium support that supports the medium from which the liquid is discharged, and a liquid discharge region by the liquid discharge head. A conveyance roller unit that constitutes a conveyance unit that conveys the medium toward the medium, and the conveyance roller unit includes a roller unit having a roller that rotates in contact with the conveyance object, and the roller unit is detachably attached. A base part, the roller unit includes a roller side fulcrum element part and a roller side movement restriction part, and the base part engages with the roller side fulcrum element part to form a fulcrum. An element portion and a base-side movement restricting portion that engages with the roller-side movement restricting portion, and the roller unit is moved toward the base portion and the both supports The element portion is engaged, characterized in that attached to the base portion by engaging the two movement restricting portion is rotated the roller unit relative to the fulcrum

  ADVANTAGE OF THE INVENTION According to this invention, when comprising the roller unit which has a roller which rotates in contact with a conveyed product so that attachment or detachment is possible with respect to a base | substrate part, the stable attachment state of a roller unit and a base | substrate part is realizable. .

The schematic structure schematic diagram showing the liquid discharge device carrying the roller unit for conveyance concerning Embodiment 1 of the present invention. The perspective view of the state which removed the roller unit from the base | substrate part showing the roller unit for conveyance which concerns on Embodiment 1 of this invention. The side view of the state which removed the roller unit from the base | substrate part showing the roller unit for conveyance which concerns on Embodiment 1 of this invention. The side view of the state which the roller side fulcrum element part showing the roller unit for conveyance which concerns on Embodiment 1 of this invention engaged with the base | substrate side fulcrum element part. The side view of the state which attached the roller unit to the base | substrate part showing the roller unit for conveyance which concerns on Embodiment 1 of this invention. The top view of the state which attached the roller unit to the base | substrate part showing the roller unit for conveyance which concerns on Embodiment 1 of this invention. The state rear view which attached the roller unit to the base | substrate part showing the roller unit for conveyance which concerns on Embodiment 1 of this invention. The perspective view showing the removal tool used when removing a roller unit from the base | substrate part in the roller unit for conveyance which concerns on Embodiment 1 of this invention, and its working state. The side view of the state which attached the roller unit to the base | substrate part showing the roller unit for conveyance which concerns on Embodiment 2 of this invention. The sectional side view of the state which attached the roller unit to the base | substrate part showing the roller unit for conveyance which concerns on Embodiment 2 of this invention. The top view of the state which attached one side of two types of roller units to the base | substrate part showing the roller unit for conveyance which concerns on Embodiment 2 of this invention. The top view of the state which attached the other of two types of roller units to the base | substrate part showing the roller unit for conveyance which concerns on Embodiment 2 of this invention. The rear view of the state which attached the roller unit to the base | substrate part showing the roller unit for conveyance which concerns on Embodiment 2 of this invention. The sectional side view of the periphery of a rotation promotion structure showing the roller unit for conveyance which concerns on other Embodiment 2 of this invention.

Hereinafter, a transport roller unit, a transport roller unit attaching / detaching method, and a liquid discharge apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
In the following description, the embodiment of the two transport roller units of the first embodiment and the second embodiment is taken as an example, and the transport roller unit is first mounted based on the transport roller unit according to the first embodiment. The schematic configuration of the liquid ejection apparatus of the present invention, the specific configuration of the transport roller unit, and the content of the method for attaching and detaching the transport roller unit of the present invention will be described.
Next, a specific configuration and operation of the transport roller unit according to the second embodiment will be described focusing on differences from the first embodiment. Further, in the description of the transport roller unit according to another embodiment, another configuration of the rotation promoting structure will be mentioned.

[Embodiment 1] (See FIGS. 1 to 8)
As shown in FIG. 1, the transport roller unit 21 according to the present embodiment is in contact with the transport object P and has a roller unit 23 having a roller 15 that rotates following the transport of the transport object P, and a roller unit. 23 is fundamentally comprised by providing with the base | substrate part 25 which is attached so that attachment or detachment is possible.
As shown in FIG. 2, the roller unit 23 includes a roller side fulcrum element portion 27 and a roller side movement restricting portion 29. The base portion 25 engages with the roller side fulcrum element portion 27 to form a fulcrum O (FIGS. 4 and 5), and the base portion side movement restriction that engages with the roller side movement restriction portion 29. Part 33.

Then, by moving the roller unit 23 toward the base portion 25, the both fulcrum element portions 27 and 31 are engaged, and by rotating the roller unit 23 with respect to the fulcrum O, both movement restricting portions 29, 33 is engaged, and the roller unit 23 is attached to the base portion 25.
Further, as shown in FIG. 1, the liquid discharge apparatus 1 of the present embodiment has a liquid discharge head 3 that discharges liquid toward a medium P (which uses the same reference numeral as the conveyed product P), and the liquid is discharged. The medium support unit 9 that supports the medium P, the transport drive roller 13 that transports the medium P toward the liquid ejection region 17 where the liquid ejection head 3 and the medium support unit 9 exist, and the transport driven roller 15 (roller 15 Are provided in the apparatus main body 2 and is basically configured.

The transport driven roller 15 is configured to be detachable from the apparatus main body 2. In the liquid ejection apparatus 1, the transport driven roller 15 is used as the roller 15 that is a constituent member of the roller unit 23 in the transport roller unit 21 of the present embodiment described above, and the base unit 25 is provided on the apparatus main body 2. It has been.
(1) Schematic configuration of liquid ejection device (see FIG. 1)
The liquid ejecting apparatus 1 shown in the drawing guides the medium P wound in a roll set in the feeding unit 18 to the liquid ejecting area 17, and ejects ink, which is an example of a liquid, to the medium P to obtain a desired one. In the inkjet printer, the recording is performed, and the recording medium P is sequentially wound by the winding unit 19.

Therefore, in this embodiment, the liquid is ink, and the liquid component in the ink is heated and dried by the radiant heat of electromagnetic waves, and the pigment component in the ink is fixed on the surface of the medium P.
The liquid ejection head 3 provided in the liquid ejection area 17 is a member that performs recording by directly ejecting liquid toward the medium P. As an example, the liquid discharge head 3 is mounted on a carriage 7 that reciprocates along the carriage guide shafts 5 and 6 provided as two examples, with the width direction B intersecting the conveyance direction A of the medium P as a scanning direction.
Further, as the medium P, in addition to paper and films of various thicknesses, natural fibers such as cotton, hemp, and silk, chemical fibers such as nylon and polyester, or a cloth or woven fabric using a mixture thereof as a raw yarn Fabrics and the like that are textile products can be used.

The medium support unit 9 is a support member that supports the medium P being transported, and is provided between the support surface of the medium support unit 9 and the discharge surface of the liquid discharge head 3 at a portion provided below the liquid discharge head 3. Has the role of defining the gap.
Further, in the illustrated embodiment, the transport driving roller 13 and the transport driven roller 15 described above are positioned in the vicinity of the lower side of the above-described carriage guide shafts 5 and 6 upstream of the transport direction A of the medium P in the liquid ejection region 17. The conveyance roller 12 provided with these is provided. Similarly to the transport roller 12, a discharge roller 16 constituted by a pair of nip rollers is provided at a downstream position in the transport direction A of the medium P in the liquid discharge region 17.

In the illustrated embodiment, a heating unit 39 for heating and drying the ink discharged onto the surface of the medium P after recording is provided at a position downstream of the discharge roller 16. The heating unit 39 includes, for example, a heater 35 that irradiates electromagnetic waves such as infrared rays, and a sensor 37 that detects radiant heat of the electromagnetic waves emitted from the heater P and emitted from the medium P.
In addition, in the illustrated embodiment, a guide roller 20 is disposed at an appropriate position on the medium conveyance path 8 formed between the feeding unit 18 and the winding unit 19. And the conveyance roller unit 21 of this invention explained in full detail below is provided with respect to the installation site | part of the driven roller 15 for conveyance.

(2) Specific configuration of the transport roller unit (see FIGS. 2 to 8)
21 A of conveyance roller units which concern on Embodiment 1 are the one base unit 25 which has the roller 15, the single base | substrate part 25 to which this roller unit 23 is attached, and the medium P from which the said roller 15 becomes a conveyed product. One type of pressing force transmission unit 41 that applies one type of pressing force F to be pressed to the roller 15 is provided.
The engagement direction X of the roller side fulcrum element part 27 and the base side fulcrum element part 31 is set in a direction from the front to the rear as an example along the conveyance direction A of the medium P. The engagement direction Z of the roller side movement restricting portion 29 and the base body side movement restricting portion 33 is set to a direction from the upper side to the lower side as an example, which intersects the conveyance direction A of the medium P.

As an example, the roller unit 23 includes two rollers 15 and 15 arranged in parallel in the width direction B, one shaft portion 43 penetrating the center of these rollers 15 and 15 in the longitudinal direction, and the shaft portion 43. And a single holder portion 45 that holds the two rollers 15 and 15 in a freely rotatable state.
And the holder part 45 is comprised by providing the main-body part 45a which actually hold | maintains the rollers 15 and 15, and the engaging part 45b extended in the engagement direction X from this main-body part 45a. A first engagement shaft portion 47 that constitutes the roller side fulcrum element portion 27 is provided at a position near the base of the engagement portion 45b, and a first portion that constitutes the roller side movement restriction portion 29 is located near the tip of the engagement portion 45b. One engaging groove 49 is provided.

Among these, the 1st engagement shaft part 47 is one rod-shaped member extended in the width direction B, and is the part exposed from the cavity parts 50 and 50 formed in two places as an example of the engagement part 45b. Is used to engage with a base side fulcrum element portion 31 to be described later.
On the other hand, the 1st engagement groove part 49 is a U-shaped groove part as an example of the predetermined depth formed from the lower surface side of the engagement part 45b. The first engagement groove portion 49 includes an opening 55 for allowing a second engagement shaft portion 53 provided on the base portion 25 side, which will be described later, to enter the groove, and a direction along the conveyance direction A of the medium P. A first restriction wall 57 and a second restriction wall 59 that restrict the movement of the roller unit 23 are provided.

In addition, a guide guide portion 61 configured as an example by an inclined surface extending obliquely from below to above is provided at the tip side of the first engagement groove portion 49. And this guidance guide part 61 is made to contact | abut to the 2nd engagement shaft part 53 provided in the base | substrate part 25 mentioned later, and thereby the opening part 55 of the 1st engagement groove part 49 of the 2nd engagement shaft part 53 is made. It has a role to lead to the position.
Further, the holder 45 has a removal tool for transmitting a force U (FIG. 8) in a direction for releasing the engagement state between the first engagement groove 49 and the second engagement shaft 53 to the roller unit 23. 63 connecting portions 65 are formed.

  Moreover, as shown in FIG. 8, the removal tool 63 is configured by a lever-like member that is long in the front-rear direction as an example. At the tip of the removal tool 63, two pressing pieces 67, 67 positioned on the upper surface side of the holder portion 45, and the center of these pressing pieces 67, 67 are formed on the holder portion 45. As an example, a hook-shaped engagement piece 69 is provided that is inserted into and engaged with a square hole-shaped engagement hole 65a.

The engagement hole 65a is a connection portion 65 for the removal tool 63.
In addition, the rear end portion extending to the front side of the removal tool 63 is an operation lever 71 that is operated and held by the operator. A bent portion 73 is formed at an intermediate portion connecting the operation lever 71 with the pressing pieces 67 and 67 and the engaging piece 69 to avoid interference with peripheral members such as the carriage guide shafts 5 and 6 described above. Is provided.

  The base portion 25 is integrally provided so as to be sandwiched between the two side plate portions 75 and 75 formed by a metal flat plate member as an example and the two side plate portions 75 and 75 as an example. A main body portion 77 formed of a plastic block-like member, a second engagement shaft portion 53 that functions as the base-side movement restricting portion 33, and the side plate portions 75 and 75 via the second engagement shaft portion 53. And an oscillating frame 79 formed by bending a metal flat plate member into an appropriate shape, for example, which also functions as a component of the pressing force transmission unit 41. ing.

A fixed position for rotating the entire transport roller unit 21A to bring the roller 15 into contact with the medium P, and a roller at a portion near the tip of the two side plate portions 75, 75 and the main body 77 arranged on the left and right A bearing portion 83 that receives a rotation shaft 81 (FIG. 2) that serves as a rotation fulcrum when switching between a fixed release position that separates 15 from the medium P is provided.
In addition, at the rear end portions of the left and right side plate portions 75, 75, as an example, inclined window portions 85, 85 having rounded squares are formed. An engagement groove 87 having a predetermined depth along the inclination of the window portions 85 and 85 is formed at the rear end portion of the main body portion 77.

  As an example, the engaging groove 87 is engaged with a cylindrical engaging piece 89 having flange portions that engage with the window portions 85 and 85 at both ends. As an example, an engagement hole 91 having a hexagonal cross section is formed at an eccentric position of the engagement piece 89 so as to extend in the longitudinal direction. Then, the rotation drive shaft 93 (FIG. 3) is inserted into the engagement hole 91 to transmit power, thereby rotating the entire transport roller unit 21A around the rotation shaft 81 at a predetermined angle. Realization is performed to switch between the fixed position and the fixed release position.

A locking shaft 97 for locking one end of an urging member 95, which is a constituent member of the pressing force transmitting portion 41, which will be described later, is provided in the width direction B at the upper part of the rear end portions of the left and right side plate portions 75, 75. It is attached to extend.
On the other hand, the swing frame 79 includes a bottom plate portion 99, side plate portions 101 and 101 raised upward from left and right side edges in the width direction B of the bottom plate portion 99, and the biasing member 95 described above. It is configured by including a locking piece 103 for locking the other end. A hole for receiving the second engagement shaft 53 is formed at a position near the tip of the left and right side plate portions 101, 101, and both ends of the second engagement shaft 53 are formed outward of the hole. It is comprised so that a part may protrude.

The width of the bottom plate 99 in the swing frame 79 is such that the two side plates 75 and 75 and the main body 77 can be accommodated between the left and right side plates 101 and 101 in the swing frame 79. Is set.
And the base side fulcrum element part 31 is comprised in the front-end | tip part in the right-and-left side board parts 101 and 101 of the rocking | fluctuation frame 79, and is formed by the U-shaped groove part as an example engaged with the 1st engagement shaft part 47. A second engaging groove 51 is provided.

The second engagement groove 51 includes an opening 105 for allowing the first engagement shaft portion 47 to enter the groove, and a pressing action wall 107 for transmitting a pressing force F against the medium P to the roller 15. And an entry guide wall 109 for guiding the entry of the first engagement shaft portion 47 is provided.
In the present embodiment, the length of the pressing action wall 107 is set to be shorter than the length of the entry guide wall 109 in order to smoothly remove the roller unit 23.

  Further, a second engagement shaft portion 53 that constitutes the base body side movement restricting portion 33 and engages with the first engagement groove portion 49 is provided at the distal end portions of the two side plate portions 75 and 75. The second engagement shaft portion 53 is a rod-shaped member extending in the width direction B, and penetrates the two side plate portions 75 and 75 and the left and right side plate portions 101 and 101 of the swing frame 79, and further these It has a length that extends outward. The shaft diameter of the second engagement shaft portion 53 is set to a dimension that fits in the first engagement groove portion 49 with almost no gap.

In addition, in the present embodiment, a leaf spring-like pressing plate 121 which is an example of the rotation promoting structure 111 is inclined at a position near the tip of the bottom plate portion 99 of the swing frame 79 so that the front becomes higher. Three are provided as an example.
Then, the rotation promoting structure 111 is arranged on the roller unit 23 so that the second engagement shaft portion 53 positioned in the opening 55 of the first engagement groove portion 49 enters the first engagement groove portion 49. In FIG. 5, it has a role of promoting rotation in the direction indicated by the arrow C.

The pressing force transmission unit 41 includes an urging member 95 for generating the pressing force F and the above-described swing frame 79 for transmitting the pressing force F generated by the urging member 95 to the roller 15. It is comprised by providing.
The urging member 95 is constituted by a tension coil spring as shown in FIG. 7 as an example, and a hook at one end of the tension coil spring is stretched between the two side plate portions 75, 75. It is installed by hanging on the stop shaft 97 and locking the hook at the other end of the tension coil spring to the elongated hole portion of the locking piece 103 provided at the rear end portion of the swing frame 79. .
Accordingly, the urging force generated by the urging member 95 is applied to the locking piece 103 serving as a force point, and the second engaging shaft portion 53 serving as a fulcrum Q is applied to the pressing action wall 107 of the second engaging groove portion 51 serving as an operating point. Communicated. Then, a pressing force F having a predetermined magnitude is applied to the roller 15 that functions as a pressing member via the shaft portion 43.

(3) How to attach and detach the transfer roller unit (see FIGS. 3 to 5)
In the method for attaching and detaching the transport roller unit according to the present embodiment, the roller unit 23 can be attached to or detached from the base portion 25 by so-called one-touch (very little operation) without using a fastening tool such as a screw. .
Specifically, the roller unit 23 provided with the roller side fulcrum element part 27 and the roller side movement restricting part 29 is compared with the base part 25 provided with the base side fulcrum element part 31 and the substrate side movement restricting part 33. The following operations are performed when attaching and detaching.

(A) Mounting process When the roller unit 23 is mounted, the roller unit 23 is transported by an insertion operation of inserting the roller unit 23 toward the base portion 25 and a rotation operation of rotating the roller unit 23 in the direction of arrow C in FIG. The roller unit 21A is attached. And among these, since the said rotation operation is performed substantially automatically by the rotation promotion structure 111, the operator can complete the attachment of the roller unit 23 only by performing the said insertion operation | movement.
That is, when the operator holds the roller unit 23 in his hand and moves it toward the base portion 25, the fulcrum element portions 27 and 31 are engaged with each other to form the fulcrum O.

Further, when the insertion operation is executed, the guide portion 61 is brought into contact with the second engagement shaft portion 53, and the front end portion of the engagement portion 45b in the holder portion 45 of the roller unit 23 is automatically directed obliquely upward. The opening 55 of the first engagement groove 47 is guided to the position of the second engagement shaft 53.
Next, since the tip end portion of the engaging portion 45b in the holder portion 45 comes into contact with the pressing plate 121 that is the rotation promoting structure 111, the roller unit 23 is in the direction indicated by the arrow C in FIG. When the second engagement shaft portion 53 enters the first engagement groove portion 49 and engages with each other, the attachment of the roller unit 23 is completed.

(B) Removal process When the roller unit 23 is removed, the roller unit 23 is rotated in the direction opposite to the direction indicated by the arrow C in FIG. Removal of the transport roller unit 21 </ b> A is performed by the pulling operation for separating the unit 25 from the unit 25. Of these, the pulling operation is performed almost automatically by the repulsive force of the leaf spring-like holding plate 121 until the engagement of both fulcrum element portions 27 and 31 is released. The substantial removal of the roller unit 23 can be completed only by performing the rotation operation.

When the removal tool 63 is used, it is as follows. That is, the operator uses the removal tool 63 to insert the engagement piece 69 of the removal tool 63 into the engagement hole 65a of the holder portion 45 and rotate the operation lever 71 side downward to restrict both movements. The engagement of the portions 29 and 33 is released.
As described above, the repulsive force of the pressing plate 121 acts on the tip end portion of the engaging portion 45b in the holder portion 45 of the roller unit 23, so that the roller unit 23 automatically moves away from the base portion 25. Then, the engagement of both fulcrum element portions 27 and 31 is released, and the removal of the roller unit 23 is completed.

  According to the transport roller unit 21A according to the first embodiment configured as described above, the roller unit 23 can be easily attached to and detached from the base unit 25, and is not affected by the transport of the transport object P. It is possible to secure a rigid engagement state between the roller unit 23 and the base portion 25 and reduce skew of the conveyed product P being conveyed.

[Embodiment 2] (See FIGS. 9 to 13)
The transport roller unit 21B according to the second embodiment includes two types of roller units 23A and 23B having different types of rollers 15A and 15B, and a single base portion to which these roller units 23A and 23B can be attached separately. 25, and two types of pressing force transmitting portions 41A and 41B that respectively apply two types of pressing forces F1 and F2 to which the rollers 15A and 15B are pressed against the medium P to the rollers 15A and 15B. .
The individual configurations of the two types of roller units 23A and 23B, the base portion 25, and the pressing force transmission portions 41A and 41B are basically the same as those described in the first embodiment. The description of the individual specific configuration of the constituent members will be omitted, and the description will be focused on the difference between the two types of roller units 23A and 23B and the difference between the two systems of pressing force transmission portions 41A and 41B.

That is, as shown in FIGS. 11 and 12, in the second embodiment, similarly to the roller unit 23 of the first embodiment, the width of the roller unit 23 </ b> A including the two roller units 15 </ b> A and 15 </ b> A and the holder unit 45. A configuration is adopted in which two types of roller units 23A and 23B of a roller unit 23B having only one short roller 15B at the center in the direction B can be selected and attached to and removed from the same base portion 25.
Among these, the roller unit 23A has a configuration almost similar to that of the roller unit 23 of the first embodiment. In the first embodiment, the roller unit 23A passes through the two gaps 50 and 50 and further reaches the outside. The length of the first engagement shaft portion 47 is shortened so that both end portions of the first engagement shaft portion 47 stay at a position near the middle of the gap portions 50 and 50.

On the other hand, as shown in FIG. 11, in the roller unit 23B, four gap portions 50 are provided so as to be aligned in the width direction B, and two in total, one for each of the left and right outer gap portions 50A and 50A. A configuration in which short first engagement shaft portions 47A and 47A are arranged is employed.
The left and right inner gaps 50B and 50B serve as escape portions to avoid interference with the left and right side plates 101B and 101B of the second swing frame 79B newly provided in the second embodiment. In addition, about the other structure, roller unit 23A, 23B has a substantially the same structure.

  In the second embodiment, a first swing frame 79A having the same configuration as the swing frame 79 of the first embodiment, and a second swing frame 79B having a shorter width than the first swing frame 79A, These two swing frames 79 are provided. The two side plate portions 75 and 75 of the base portion 25 are located inside the left and right side plate portions 101A and 101A of the first swing frame 79A, and the second side plate portions 75 and 75 are positioned inwardly of the two side plate portions 75 and 75. 2 The left and right side plate portions 101B and 101B of the swing frame 79B are disposed so as to be positioned.

Further, a plate-like cam lever 123 functioning as a cam follower is further extended at the rear end of the second swing frame 79B, and as shown in FIGS. On the other hand, the second swing frame 79B can be swung with the second engagement shaft portion 53 as a fulcrum Q by the contact position with the camshaft 127 attached in an eccentric state.
Then, only the roller unit 23A can be swung via the first engagement shaft portion 47 engaged with the second engagement groove 51B (FIG. 10) of the second swing frame 79B. It is possible to switch between a contact position where only the roller 15A is brought into contact with the medium P and a separation position where the roller 15A is separated from the medium P.

Further, the first engagement shaft portions 47A and 47A having two short rollers provided in the roller unit 23B are configured to engage the second engagement groove portion 51 of the first swing frame 79A.
In the second embodiment, the pressing force transmitting portion 41A configured by including the first swing frame 79A and the two first biasing members 95A having a large biasing force, and the second swinging force are provided. There are provided two systems of pressing force transmission portions 41, ie, a pressing force transmission portion 41B configured by including a frame 79B and one second urging member 95B having a small urging force.

Then, the urging force generated by the first urging member 95A is transmitted to the roller unit 23B via the first swing frame 79A, and is, for example, 100N relatively to the roller 15B of the roller unit 23B. A large pressing force F2 is transmitted.
On the other hand, the urging force generated by the second urging member 95B is transmitted to the roller unit 23A via the second swing frame 79B, and is relatively small, for example, 25N with respect to the roller 15A of the roller unit 23A. The pressing force F1 is transmitted.

  The transport roller unit 21B according to the second embodiment configured as described above can also enjoy the same operations and effects as the transport roller unit 21A according to the first embodiment. Further, according to the second embodiment, It is possible to apply different pressing forces F1 and F2 to the rollers 15A and 15B simply by attaching different types of roller units 23A and 23B using the base portion 25 having the same structure.

[Other Embodiments]
The transport roller unit, the transport roller unit attaching / detaching method, and the liquid discharge apparatus according to the present invention are basically based on the configuration as described above, but are within the scope not departing from the gist of the present invention. Of course, it is possible to change or omit the partial configuration.
For example, as shown in FIG. 14, the following configuration can be used instead of the rotation promoting structure 111 configured by the leaf spring-like pressing plate 21 in the first embodiment. That is, the magnetic piece 129 is installed on the lower surface of the engaging portion 45b in the holder portion 45 of the roller unit 23, and the magnet 131 is provided to the bottom plate portion 99 of the swing frame 79 at a position facing the magnetic piece 129. It is also possible to employ the rotation promoting structure 111A.
Even when the rotation promoting structure 111A having such a configuration is employed, the rotation of the roller unit 23 in the direction indicated by the arrow C with the fulcrum O as the center can be realized by a magnetic force.

Further, the relationship between the “engagement shaft portion” and the “engagement groove portion” applied to the roller side fulcrum element portion 27 and the substrate side branch element portion 31 is reversed from that of the first embodiment, and the roller side fulcrum element portion 27 is changed to “ It is possible to configure the base-side fulcrum element portion 31 with an “engagement shaft portion”.
Similarly, the relationship between the “engagement groove portion” and the “engagement shaft portion” applied to the roller side movement restricting portion 29 and the substrate side movement restricting portion 33 is reversed from that in the first embodiment, and the roller side movement restricting portion 29 is changed. It is possible to configure with the “engagement shaft portion” and the base-side movement restricting portion 33 with the “engagement groove portion”.

In addition, the transport roller unit 21 of the present invention can change the number and position of use according to the width dimension of the medium P to be used. In the second embodiment, the pressing roller unit 21 has different sizes depending on the position of use. The roller units 23A and 23B having the forces F1 and F2 can be used properly.
Therefore, the roller unit 23B that gives a large pressing force F2 is used for the side edge portion or the like of the transported object P where damage to the transported object P does not cause a problem even if a large pressing force F2 is applied. In other parts where damage to the surface becomes a problem, it is possible to use a roller unit 23A that applies a small pressing force F1.
Furthermore, the transport roller unit 21 of the present invention is not limited to the liquid discharge device such as the ink jet printer described in the first embodiment, but other types of recording devices such as a laser printer and a copying machine, and a sheet-like transport object P. The present invention can be applied to various transport devices that are transporting.
Furthermore, in the above description, the example in which the present invention is applied to the driven roller for conveyance is shown, but it is also possible to apply the present invention to a driving roller for conveyance.

In each of the embodiments, the ink having the property that the liquid component in the ink is heated and dried by the radiant heat of electromagnetic waves and the pigment component in the ink is fixed on the surface of the medium P is used, but the present invention is not limited to this. Water-based ink, oil-based ink, or electromagnetic wave curable ink that is cured by irradiation with electromagnetic waves may be used.
Moreover, although it was set as the structure provided with the heater 35 which irradiates electromagnetic waves, such as infrared rays, as an example of the heating part 39, you may employ | adopt another heating mechanism and a fixing mechanism. For example, a contact-type heating mechanism that heats the medium P in contact with the recording surface of the medium P or the back surface opposite to the recording surface, or an electromagnetic wave irradiation unit that emits electromagnetic waves may be used. Moreover, it is good also as a structure which does not provide the heating part 39. FIG.

  Moreover, although the roller which contacts and rotates the conveyed product P was used as the driven roller 15 for conveyance, it is not limited to this. For example, a roller or a plate-like member that does not rotate may be used. Moreover, although the roller which contacts and rotates the conveyed product P was used as the drive roller 13 for conveyance, it is not limited to this. For example, a belt-type transport mechanism may be used.

  The present invention is not limited to the above-described embodiments, and various modifications within the scope of the invention described in the claims are possible, and these are also included in the scope of the present invention. Needless to say.

The present invention has been described in detail above based on specific embodiments. Here, the present invention will be described once more collectively.
The conveyance roller unit 21 according to the first aspect of the present invention includes a roller unit 23 having a roller 15 that rotates in contact with the conveyed product P, and a substrate unit 25 to which the roller unit 23 is detachably attached. The roller unit 23 includes a roller side fulcrum element unit 27 and a roller side movement restricting unit 29, and the base unit 25 includes a roller side fulcrum element unit 27 and a roller side fulcrum element unit 27. A base-side fulcrum element part 31 that engages to constitute the fulcrum O and a base-side movement restriction part 33 that engages with the roller-side movement restriction part 29 are provided, and the roller unit 23 is moved toward the base part 25. The fulcrum element portions 27 and 31 are engaged with each other, the roller unit 23 is rotated with respect to the fulcrum O, and the both movement restricting portions 29 and 33 are engaged with each other to form the base portion 2. Wherein the attached thing.

Here, the “fulcrum element portion” in the “roller side fulcrum element portion 27” and the “base side fulcrum element portion 31” is rotated by engaging one of them as a rotation shaft and the other as a bearing. It means what constitutes the fulcrum O.
In addition, the “movement restriction part” in the “roller side movement restriction part 29” and the “base body side movement restriction part 33” is such that one is an engaging part and the other is an engaged part, and both are engaged. This means that the roller unit 23 is attached to the base portion 25 in a state where movement of the conveyed product P in the transport direction A is restricted.

According to this aspect, when the roller unit 23 having the roller 15 that rotates in contact with the conveyed product P is configured to be detachable with respect to the base portion 25, the roller unit 23 and the base portion 25 are stably attached. Can be realized. That is, the roller unit 23 moves in the transport direction A when the transported object P is transported by the two types of rigid and different directions of engagement by the both fulcrum element portions 27 and 31 and the movement restricting portions 29 and 33. It is possible to reduce the trouble of tilting or tilting.
Therefore, the inclination of the conveyed product P caused by the problem can be reduced. In addition, by combining the two types of engagements, the roller unit 23 can be easily and reliably attached to the base portion 25.

  In the transport roller unit 21 according to the second aspect of the present invention, in the first aspect, the engagement direction X between the roller side fulcrum element portion 27 and the base side fulcrum element portion 31 is the transport direction A of the transported object P. The engagement direction Z of the roller side movement restricting portion 29 and the substrate side movement restricting portion 33 is set in a direction intersecting with the conveyance direction A of the conveyed product P.

  According to this aspect, the operation performed by the operator when attaching the roller unit 23 to the base portion 25 basically needs only to insert the roller unit 23 in the direction along the conveyance direction A of the conveyed product P. In addition, after the roller unit 23 is mounted, the engagement direction Z is set along the transport direction A of the roller unit 23 by the both movement restricting portions 29 and 33 set in a direction intersecting the transport direction A of the transported object P. Directional movement and tilt are effectively suppressed.

  The transport roller unit 21 according to the third aspect of the present invention is the first aspect or the second aspect. The roller unit 23 includes a roller 15 and a holder portion 45 that holds the roller 15. 45, a first engagement shaft portion 47 constituting the roller side fulcrum element portion 27 and a first engagement groove portion 49 constituting the roller side movement restricting portion 29 are provided, and the base portion 25 is provided with a base portion side fulcrum. The second engagement groove portion 51 that constitutes the element portion 31 and engages with the first engagement shaft portion 47, and the second engagement that constitutes the base-side movement restriction portion 33 and engages with the first engagement groove portion 49. A shaft portion 53 is provided.

  According to this aspect. It is possible to engage the both fulcrum element portions 27 and 31 and the movement restricting portions 29 and 33 in such a manner that a relatively simple and rigid engagement state is obtained by the engagement shaft portion and the engagement groove portion. . Further, since the roller unit 23 is basically configured by including the roller 15 and the holder portion 45, it is possible to provide a roller unit 23 that is simple in structure, lightweight, and inexpensive.

  The transport roller unit 21 according to the fourth aspect of the present invention, in the third aspect, includes an opening 55 for allowing the second engagement shaft portion 53 to enter the first engagement groove portion 49, and the conveyed product P. A first restriction wall 57 and a second restriction wall 59 for restricting movement of the roller unit 23 in the direction along the transport direction A are provided.

  According to this aspect, when the both movement restricting portions 29 and 33 are engaged, the two engagement restricting portions 29 and 33 can be smoothly engaged by causing the second engaging shaft portion 53 to enter from the opening 55. it can. In addition, when the engagement between the movement restricting portions 29 and 33 is completed, the first restricting wall 57 and the second restricting wall 59 are in contact with each other so as to sandwich the second engaging shaft portion 53. The movement of the roller unit 23 in the direction along the conveyance direction A of the conveyed product P can be effectively restricted.

  In the fourth aspect, the transport roller unit 21 according to the fifth aspect of the present invention includes an opening 105 for allowing the first engagement shaft portion 47 to enter the second engagement groove 51, and the conveyed product P. A pressing action wall 107 for transmitting the pressing force F to the roller 15 and an entry guide wall 109 for guiding the entry of the first engagement shaft portion 47 are provided.

According to this aspect, when the both fulcrum element parts 27 and 31 are engaged, the first engagement shaft part 47 is caused to enter from the opening 105 so that the both fulcrum element parts 27 and 31 can be smoothly engaged. it can. At this time, the first engagement shaft portion 47 is guided in contact with the entry guide wall 109, and thus can smoothly enter the second engagement groove portion 51.
Further, when the engagement between the fulcrum element portions 27 and 31 is completed, the pressing action wall 107 comes into contact with the first engagement shaft portion 47 so that the pressing force transmitting portion 41 functions. The pressing force F can be applied.

  In the fourth aspect or the fifth aspect, the transport roller unit 21 according to the sixth aspect of the present invention causes the holder portion 45 to abut on the second engagement shaft portion 53 provided in the base portion 25. Thus, there is provided a guiding guide portion 61 for guiding the opening 55 of the first engagement groove portion 49 to the position of the second engagement shaft portion 53.

  According to this aspect, the guide unit 61 is brought into contact with the second engagement shaft portion 53 by moving the roller unit 23 toward the base portion 25 side and performing the engaging operation of the both fulcrum element portions 27 and 31. The opening 55 of the first engagement groove 49 is automatically guided to the position of the second engagement shaft 53. Accordingly, it is possible to smoothly shift to the engaging operation of the both movement restricting portions 29 and 33 to be performed next.

  In the transport roller unit 21 according to the seventh aspect of the present invention, in any one of the fourth to sixth aspects, both the holder part 45 and the base part 25, or any one of them, A rotation promoting structure 111 that promotes the rotation of the roller unit 23 so that the second engagement shaft portion 53 located in the opening 55 of the first engagement groove portion 49 enters the first engagement groove portion 49 is provided. It is provided.

According to this aspect, since the rotation promoting structure 111 is provided, when the opening 55 of the first engagement groove portion 49 reaches the position of the second engagement shaft portion 53, the roller unit 23 is almost automatically set. The fulcrum O rotates about the fulcrum O, and the smooth engagement of both the movement restricting portions 29 and 33 is executed.
Therefore, the operation performed by the operator when the roller unit 23 is attached is only an insertion operation for moving the roller unit 23 toward the base portion 25, and the attachment of the roller unit 23 to the base portion 25 is further facilitated.

  In the transport roller unit 21 according to the eighth aspect of the present invention, in any one of the third to seventh aspects, the holder portion 45 includes a first engagement groove portion 49 and a second engagement shaft. A connection structure 65 for a removal tool 63 for transmitting a force U in a direction for releasing the engagement state with the portion 53 to the roller unit 23 is provided.

  According to this aspect, even in a work environment where the peripheral members are in the way and it is difficult to remove the roller unit 23, the roller unit 23 can be smoothly inserted into the base portion without damaging or fouling the roller unit 23 or the peripheral members. 25 can be removed.

  According to the ninth aspect of the present invention, the method for attaching and detaching the transport roller unit includes a roller unit 23 including a roller side fulcrum element part 27 and a roller side movement restricting part 29, a base side fulcrum element part 31 and a base side movement. When the roller unit 23 is attached to or detached from the base unit 25 including the restricting unit 33, the roller unit 23 is moved toward the base unit 25 to engage the both fulcrum element units 31. After the fulcrum O is formed, the roller unit 23 is attached by rotating it in the engagement direction Z of the both movement restricting portions 29 and 33 around the fulcrum O. When the roller unit 23 is removed, After rotating the roller unit 23 around the O in the disengagement direction of the movement restricting portions 29 and 33 to release the engagement, the roller unit 23 is moved to the base portion 2. Characterized in that as removed by moving in a direction away from.

According to this aspect, when the roller unit 23 is attached to the base portion 25, the inserting operation for moving the roller unit 23 toward the base portion 25, and the engagement between the both fulcrum element portions 27 and 31, This can be done by performing two operations, a rotation operation that rotates the roller unit 23 in the engagement direction Z of the movement restricting portions 29 and 33 with the part as a fulcrum O.
Similarly, when removing the roller unit 23 from the base portion 25, a rotation operation for rotating the roller unit 23 around the fulcrum O in the disengagement direction of both movement restricting portions 29 and 33, and the roller unit It is possible to perform the operation by two operations, that is, a pulling-out operation for separating 23 from the base portion 25.
Therefore, according to this aspect, the roller unit 23 can be attached to and detached from the base portion 25 easily and smoothly.

  The liquid ejection apparatus 1 according to the tenth aspect of the present invention includes a liquid ejection head 3 that ejects liquid toward the medium P, a medium support unit 9 that supports the medium P on which the liquid is ejected, and the liquid ejection head 3. And a transport roller unit 21 that constitutes a transport unit 11 that transports the medium P toward the liquid discharge region 17, and the transport roller unit 21 includes a roller 15 that rotates in contact with the transported material P. 23 and a base part 25 to which the roller unit 23 is detachably attached. The roller unit 23 includes a roller side fulcrum element part 27 and a roller side movement restricting part 29. The base part 25 is a roller side fulcrum. A base-side fulcrum element part 31 engaging with the element part 27 to form the fulcrum O, and a base-side movement restricting part 33 engaging with the roller side movement restricting part 29; The unit 23 is moved toward the base portion 25 to engage the both fulcrum element portions 27 and 31, and the roller unit 23 is rotated with respect to the fulcrum O to engage the both movement restricting portions 29 and 33. It is characterized by being attached to the base portion 25 together.

  According to this aspect, the exchange operation of the conveyance driven roller 15 is easy and smooth. Further, since the tilt of the transport driven roller 15 when the medium P is transported can be reduced, the tilt of the medium P caused by the tilt of the transport driven roller 15 is suppressed, so that the transport of the medium P can be performed smoothly. It is possible to improve the recording execution quality.

DESCRIPTION OF SYMBOLS 1 Liquid discharge apparatus, 2 apparatus main body, 3 Liquid discharge head, 5 Carriage guide shaft,
6 Carriage guide shaft, 7 Carriage, 8 Medium transport path, 9 Medium support part,
11 transport unit, 12 transport roller, 13 transport drive roller,
15 Follower roller for conveyance (roller), 16 Roller for discharge,
17 liquid discharge area, 18 feeding section, 19 winding section, 20 guide roller,
21 Roller unit for conveyance, 23 Roller unit, 25 Base part,
27 Roller side fulcrum element part, 29 Roller side movement restriction part,
31 base side fulcrum element part, 33 base side movement restricting part, 35 heater,
37 sensor, 39 heating part, 41 pressing force transmission part, 43 shaft part,
45 holder part, 45a main body part, 45b engaging part, 47 first engaging shaft part,
49 first engagement groove, 50 gap, 51 second engagement groove, 53 second engagement shaft,
55 opening part, 57 1st regulation wall, 59 2nd regulation wall, 61 guidance guide part,
63 removal tool, 65 connection structure, 65a engagement hole, 67 holding piece,
69 engagement piece, 71 operation lever, 73 bent part, 75 side plate part, 77 main body part,
79 Swing frame, 81 Rotating shaft, 83 Bearing part, 85 Window part, 87 Engaging groove,
89 engaging pieces, 91 engaging holes, 93 rotary drive shafts, 95 biasing members, 97 locking shafts,
99 bottom plate portion, 101 side plate portion, 103 locking piece, 105 opening portion,
107 pressing action wall, 109 approach guide wall, 111 rotation promoting structure,
121 holding plate, 123 cam lever, 125 swing shaft, 127 cam shaft,
129 magnetic piece, 131 magnet, P transported object (medium), O fulcrum, A transport direction,
B width direction, F pressing force, X engagement direction, Z engagement direction,
U force (in direction of disengagement), C arrow, Q fulcrum

Claims (10)

A roller unit having a roller in contact with the conveyed product;
A base portion to which the roller unit is detachably attached,
The roller unit includes a roller side fulcrum element part and a roller side movement restriction part,
The base portion includes a base-side fulcrum element portion that engages with the roller-side fulcrum element portion to form a fulcrum, and a base-side movement restriction portion that engages with the roller-side movement restriction portion.
The roller unit is moved toward the base part to engage the both fulcrum element parts, and the roller unit is rotated with respect to the fulcrum to engage the both movement restricting parts. A roller unit for conveyance, characterized in that it is attached to a roller. In the roller unit for conveyance according to claim 1,
The direction of engagement between the roller side fulcrum element part and the base side fulcrum element part is set in a direction along the conveyance direction of the conveyed product,
The roller unit for transporting, wherein an engagement direction of the roller side movement restricting portion and the base body side movement restricting portion is set in a direction intersecting with the transport direction of the transported object. In the roller unit for conveyance according to claim 1 or 2,
The roller unit includes the roller and a holder portion that holds the roller.
The holder part is provided with a first engagement shaft part constituting the roller side fulcrum element part and a first engagement groove part constituting the roller side movement restricting part,
The base portion includes the base portion side fulcrum element portion, the second engagement groove portion that engages with the first engagement shaft portion, and the base portion side movement restriction portion, and the first engagement groove portion. And a second engagement shaft portion that engages with the roller unit. In the roller unit for conveyance according to claim 3,
In the first engagement groove portion, an opening for allowing the second engagement shaft portion to enter, a first restriction wall for restricting movement of the roller unit in a direction along the conveyance direction of the conveyed product, and a second A roller unit for conveyance, characterized in that a regulating wall is provided. In the roller unit for conveyance according to claim 4,
In the second engagement groove portion, an opening for allowing the first engagement shaft portion to enter, a pressing action wall for transmitting a pressing force against a conveyed product to the roller, and the first engagement shaft portion An entrance guide wall for guiding the entrance of the transport roller unit. In the roller unit for conveyance according to claim 4 or 5,
In the holder portion, a guide guide portion that guides the opening portion of the first engagement groove portion to the position of the second engagement shaft portion by contacting the second engagement shaft portion provided in the base portion. The roller unit for conveyance characterized by the above-mentioned. In the roller unit for conveyance as described in any one of Claim 4 to 6,
The second engagement shaft portion positioned at the opening of the first engagement groove portion may enter the first engagement groove portion in both or either of the holder portion and the base portion. The roller unit for conveyance is provided with a rotation promoting structure for urging the roller unit to rotate. In the roller unit for conveyance as described in any one of Claim 3 to 7,
The holder portion is provided with a connection portion for a removal tool for transmitting a force in a direction for releasing the engagement state between the first engagement groove portion and the second engagement shaft portion to the roller unit. The roller unit for conveyance characterized by having. When attaching and detaching the roller unit including the roller side fulcrum element part and the roller side movement restricting part to the base part including the base side fulcrum element part and the base side movement restricting part,
When attaching the roller unit, the roller unit is moved toward the base portion to engage the both fulcrum element portions to form a fulcrum, and then the roller unit is moved around the fulcrum. Mounting by rotating in the direction of engagement of the movement restricting part,
When removing the roller unit, the roller unit is rotated about the fulcrum in the disengagement direction of the both movement restricting portions to release the engagement, and then the roller unit is removed from the base portion. A conveying roller unit attaching / detaching method, wherein the removing unit is removed by moving in a separating direction. A liquid discharge head for discharging liquid toward the medium;
A medium support unit for supporting the medium from which the liquid is discharged;
A transport roller unit that constitutes a transport unit that transports a medium toward a liquid discharge region by the liquid discharge head;
The transport roller unit includes a roller unit having a roller that contacts a medium, and a base unit to which the roller unit is detachably attached,
The roller unit includes a roller side fulcrum element part and a roller side movement restriction part,
The base portion includes a base-side fulcrum element portion that engages with the roller-side fulcrum element portion to form a fulcrum, and a base-side movement restriction portion that engages with the roller-side movement restriction portion.
The roller unit is moved toward the base part to engage the both fulcrum element parts, and the roller unit is rotated with respect to the fulcrum to engage the both movement restricting parts. A liquid ejecting apparatus that is attached to the liquid ejecting apparatus.

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