JP6323664B2 - PRESSING UNIT AND LIQUID DISCHARGE DEVICE - Google Patents

Description

  The present invention relates to a pressing unit used for pressing a pressing member against an object to be pressed, and a liquid ejecting apparatus including the pressing unit.

The pressing mechanism used for pressing the pressing member against the pressing target is used as a mechanism for transporting the medium by pressing the transport driven roller against the transport driving roller, as shown in Patent Documents 1 and 2 below. ing.
In Patent Document 1, engagement between a concave portion formed in a holder portion that holds a roller and a shaft portion provided on the pressing mechanism side, a leaf spring-like locking tool attached to the holder portion, and a pressing mechanism side A structure is disclosed in which the pressing member is detachably attached to the pressing mechanism by the locking action with the frame.
Patent Document 2 discloses a configuration in which the paper pressing roller is made constant by using two types of springs, a coil spring and an assisting coil spring, to offset fluctuations in the biasing force of the coil spring due to a difference in paper thickness. Has been.

JP 2006-56642 A JP 2013-230932 A

However, Patent Document 1 only discloses a configuration in which a roller as a pressing member is detachably attached to a pressing mechanism, and there is no description about a configuration for switching the pressing force of the roller. There is no suggestion.
Moreover, the said patent document 2 only discloses the structure which uses two types of springs and makes constant pressing force, and does not touch at all about the point which switches and uses the pressing force of the said roller.
Here, taking a large ink jet printer as an example, a plurality of transport driven rollers serving as pressing members are arranged in the width direction of the medium, and the pressing force of all these transport driven rollers is not uniform and transport The pressing force may be adjusted depending on the position where the driven roller is attached.

  However, the conventional configuration including Patent Documents 1 and 2 cannot easily switch the pressing force.

  An object of the present invention is to change a pressing force by changing a mounting position of a pressing member in a pressing unit used to press the pressing member against a pressing target.

  The pressing unit according to the first aspect of the present invention is a pressing unit used for pressing a pressing member against a pressing target, and a plurality of mounting portions to which the pressing member is detachably mounted, and different pressings to the mounting portions. And a pressing force generation mechanism for generating a force.

  The pressing unit according to a second aspect of the present invention is the pressing unit according to the first aspect, wherein the pressing force generating mechanism receives the urging forces of the plurality of different urging members and the urging members individually. A plurality of biasing force transmission members that transmit to the part, and the pressing unit presses the pressing member against the pressing target, whereby the biasing force is transmitted by the biasing force transmission member to which the pressing member is attached. And the pressing force is generated.

  A pressing unit according to a third aspect of the present invention includes, in the second aspect, a support base body and a plurality of swing frames that are swingably connected to the support base body via a common fulcrum shaft. The plurality of attachment portions are provided at one end of the plurality of swing frames, the plurality of biasing members are provided at the other end of the plurality of swing frames, and the common fulcrum shaft is the plurality of swing frames. The mounting portion is located on the side away from the mounting portion, and the plurality of urging members are individually provided between the support base body and each swing frame. Features.

  The pressing unit according to a fourth aspect of the present invention is the pressing unit according to the third aspect, wherein the swing frame is in a state where the pressing member is not in contact with the pressing target, and the pressing member is pressed. It is possible to oscillate around the common fulcrum shaft as a fulcrum between the second oscillating position taken in a state of being pressed against the object by the pressing force.

  A pressing unit according to a fifth aspect of the present invention is the pressing unit according to the fourth aspect, wherein the support base body rotates about a rotation shaft, and the swing frame is moved to the second swing position by the rotation. And the pressing member is pressed against the pressing object by the pressing force.

  The pressing unit according to a sixth aspect of the present invention is the pressing unit according to the fifth aspect, wherein the support base body rotates in the pressing direction with the rotation shaft as a fulcrum, and the pressing member contacts the pressing target. By restricting the movement in the same direction, a movement of the support base body in the direction opposite to the rotation direction occurs with respect to the common fulcrum shaft in the swing frame, and the movement in the reverse direction causes the attachment to occur. The urging force of the urging member is applied, and the pressing force is generated.

  The pressing unit according to a seventh aspect of the present invention is the pressing unit according to any one of the third to sixth aspects, wherein the biasing member is a tension coil spring, and the pressing unit presses the pressing member. , The swinging frame rotates about the common fulcrum shaft in the direction of extending the tension coil spring, and the urging force is generated by the extension, and the urging force is transmitted to the pressing member as the pressing force. It is characterized by that.

  The pressing unit of the eighth aspect of the present invention is the pressing unit according to any one of the third to seventh aspects, wherein the pressing action position where the pressing member contacts the pressing target is relative to the common fulcrum shaft. It is characterized by being located farther from the mounting portion.

  A liquid ejection apparatus according to a ninth aspect of the present invention includes a liquid ejection head that ejects liquid toward a medium, a medium support that supports the medium from which the liquid is ejected, and a liquid ejection area formed by the liquid ejection head. A conveyance unit that conveys the medium toward the medium, and the conveyance unit includes the pressing unit and the pressing member according to any one of the first to eighth aspects, and the pressing member is used for conveyance. It is a drive roller or a driven roller for conveyance.

  The pressing unit according to a tenth aspect of the present invention is the pressing unit according to any one of the fourth to ninth aspects, wherein the pressing unit includes a plurality of pressing units at an appropriate interval in the width direction of the medium support portion. The pressing members are attached to a first mounting portion connected to a first pressing force generating mechanism having a strong pressing force, and a part of the plurality of pressing units is attached to the plurality of sets. All or part of the other part of the pressing unit is characterized in that the pressing member is attached to a second attachment part connected to a second pressing force generating mechanism having a weak pressing force.

  The pressing unit according to an eleventh aspect of the present invention is the pressing unit according to the tenth aspect, wherein the second pressing force generating mechanism includes a nip position where the pressing member abuts against the pressing target, and the pressing member from the pressing target. There is provided a switching mechanism that enables individual switching between the release positions to be separated from each other, and each individual switching mechanism of the second pressing force generating mechanism is operated simultaneously by receiving power from a single operating body. It is characterized by.

  According to the present invention, in the pressing unit used to press the pressing member against the pressing target, the pressing force can be changed by changing the mounting position of the pressing member.

The schematic structure schematic diagram showing the liquid ejection device carrying the pressing unit concerning the embodiment of the present invention. The top view showing the state which has arranged several sets of pressing units concerning the embodiment of the present invention in the width direction. The perspective view of the state which removed the pressing member from the pressing unit showing the pressing unit which concerns on embodiment of this invention. The side view of the state which removed the pressing member from the pressing unit showing the pressing unit which concerns on embodiment of this invention. The side view in case the pressing unit of the state which attached the pressing member to the pressing unit showing the pressing unit which concerns on embodiment of this invention exists in a release position. The side view in case the pressing unit of the state which attached the pressing member to the pressing unit showing the pressing unit which concerns on embodiment of this invention exists in a contact start position. The side view in case the pressing unit of the state which attached the pressing member to the pressing unit showing the pressing unit which concerns on embodiment of this invention exists in a nip position. The sectional side view at the time of the pressing unit of the state which attached the pressing member to the pressing unit showing the pressing unit which concerns on embodiment of this invention arrived at the nip position. The top view of the state which attached one side of two types of pressing members to the pressing unit showing the pressing unit which concerns on embodiment of this invention. The top view of the state which attached the other of two types of pressing members to the pressing unit showing the pressing unit which concerns on embodiment of this invention. The rear view of the state which attached the pressing member to the pressing unit showing the pressing unit which concerns on embodiment of this invention. The perspective view showing the individual switching mechanism and action body at the time of providing a plurality of sets of pressing units concerning an embodiment of the present invention.

Hereinafter, a pressing unit and a liquid ejection device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
In the following description, the schematic configuration of the liquid ejection apparatus of the present invention in which the pressing unit of the present embodiment is first mounted will be described, and then the specific configuration of the pressing unit and the operation mode thereof will be described. Then, the structure and operation mode of the switching mechanism and the operating body when a plurality of pressing units according to the present embodiment are arranged will be described.

[Embodiment] (See FIGS. 1 to 12)
As shown in FIG. 3 and subsequent figures, the pressing unit 25 according to this embodiment is used to press the pressing member 23 against the pressing target 24. The pressing unit 25 includes a plurality of mounting portions 31 to which the pressing member 24 is detachably attached, and a pressing force generating mechanism 41 that generates different pressing forces F at the mounting portions 31.

  Further, as shown in FIG. 1, the liquid ejection apparatus 1 of the present embodiment includes a liquid ejection head 3 that ejects liquid toward the medium P, and a medium support unit 9 that supports the medium P on which the liquid is ejected. And a transport unit 11 having a transport drive roller 13 and a transport driven roller 15 for transporting the medium P toward the liquid discharge region 17 in which the liquid discharge head 3 and the medium support unit 9 exist. I have.

The transport driven roller 15 functions as a pressing member 23 or a constituent member of the pressing member 23 that is detachably attached to the pressing unit 25 of the present embodiment. The conveyance drive roller 13 becomes a pressing object 24 of the pressing member 23.
The pressing unit 25 is provided to the apparatus main body 2, and the pressing member 23 is detachably attached to the pressing unit 25.

The liquid ejecting apparatus 1 shown in the drawing guides a 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.
In the present embodiment, as shown in FIG. 2, a plurality of pressing units 25 are arranged in the width direction B with appropriate intervals.

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 discharge head 3 provided in the liquid discharge region 17 is a member that discharges liquid directly toward the medium P and executes recording. As an example, the liquid discharge head 3 is provided along the carriage guide shafts 5 and 6 provided in two. It is mounted on a carriage 7 that reciprocates with the width direction B intersecting the transport direction A as the 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 ejected on the surface of the medium P after recording is provided at a downstream position 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 pressing unit 25 which concerns on embodiment of this invention explained in full detail below with respect to the installation site | part of the driven roller 15 for conveyance is provided.

(2) Specific configuration of the pressing unit (see FIGS. 3 to 11)
As shown in FIGS. 3 to 11, the pressing unit 25 according to the present embodiment individually receives a plurality of urging members 95 having different pressing force generation mechanisms 41 and the urging forces of the plurality of urging members 95. And a swing frame 79 that functions as a plurality of urging force transmission members that transmit to the attachment portion 31.
Then, the pressing unit 25 presses the pressing member 23 against the pressing target 24, so that the urging force is transmitted to the mounting portion 31 by the swing frame 79 to which the pressing member 23 is mounted, and the pressing force F is generated. Has been.

Further, the pressing unit 25 according to the present embodiment includes a plurality of attachment portions 31 and a pressing force generating mechanism 41. The pressing member 23 is provided with an attached portion 27 attached to one of the plurality of attaching portions 31.
Therefore, in this embodiment, it is not necessary to adjust the pressing force F on the pressing member 23 side, and the pressing force F is automatically switched only by selecting the attachment portion 31 to which the pressing member 23 is attached.

Further, as shown in FIG. 3, in this embodiment, the pressing member 23 includes an attached portion 27 and a pressing portion side movement restricting portion 29. On the other hand, the pressing unit 25 engages with the attached portion 27 to form a fulcrum O, and engages with the attaching portion 31 that transmits the pressing force F to the pressing member 23 and the pressing portion side movement restricting portion 29. And a base-side movement restricting portion 33 for restricting the movement of the pressing member 23 in the transport direction A.
Then, by moving the pressing member 23 so as to be inserted toward the pressing unit 25, the attached portion 27 and the attaching portion 31 are engaged, and the pressing member 23 is rotated about the fulcrum O. Both the movement restricting portions 29 and 33 are engaged so that the pressing member 23 is attached to the pressing unit 25.

Further, the engagement direction X between the attached portion 27 and the attachment portion 31 is set in a direction from the front to the rear as an example along the conveyance direction A of the medium P. On the other hand, the engagement direction Z of the pressing portion 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 transport direction A of the medium P.
As shown in FIGS. 9 and 10, in this embodiment, two types of pressing members 23 </ b> A and 23 </ b> B each having different types of transport driven rollers 15 </ b> A and 15 </ b> B are prepared. That is, one of the pressing members 23A is composed of two conveying driven rollers 15A and 15A arranged in parallel in the width direction B as shown in FIG. 10, and these conveying driven rollers 15A and 15A. A single shaft portion 43 penetrating the center in the longitudinal direction, and a single holder portion 45 that holds the two driven rollers 15A and 15A for conveyance through the shaft portion 43 in a freely rotatable state. ing.

  The holder portion 45 includes a main body portion 45a that actually holds the two driven rollers 15A and 15A for conveyance, and an engagement portion 45b that extends in the engagement direction X from the main body portion 45a. Further, a first engagement shaft portion 47 constituting the attached portion 27 is provided at a position near the base of the engaging portion 45b, and the pressing portion side movement restricting portion 29 is constituted at a position near the tip of the engaging portion 45b. A first engagement 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 to the cavity parts 50 and 50 formed in two places as an example of the engagement part 45b. Is used to engage with a mounting 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 49 is pressed in the direction along the conveyance direction A of the medium P, and an opening 55 for allowing a second engagement shaft 53 provided on the pressing unit 25 side, which will be described later, to enter the groove. A first restriction wall 57 and a second restriction wall 59 that restrict the movement of the member 23A 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 pressing unit 25, and thereby the opening part 55 of the 1st engagement groove part 49 is made into the position of the 2nd engagement shaft part 53. Has a guiding role.
Further, the holder 45 has a connection portion for a removal tool (not shown) for transmitting a force in a direction for releasing the engagement state between the first engagement groove 49 and the second engagement shaft 53 to the pressing member 23A. As an example, an engagement hole 65 a having a square hole shape is formed as 65.

In addition, as shown in FIG. 9, the other pressing member 23B is a pressing member 23 provided with only one short transport driven roller 15B at the center in the width direction B of the holder portion 45 in this embodiment. is there.
The pressing member 23B is provided with four gaps 50 so that the gaps 50 are arranged in the width direction B. Among these, two short first engaging shaft portions 47A and 47A are arranged in each of the left and right outer space portions 50A and 50A.
The left and right inner gaps 50B and 50B serve as escape portions for avoiding interference with the left and right side plates 101B and 101B of the second swing frame 79B described later. In addition, about the other structure, the pressing members 23A and 23B have the substantially same structure.

In this embodiment, as shown in FIG. 3, the pressing unit 25 can swing with the support base body 74 via a support base body 74 and a second engagement shaft portion 53 described later serving as a common fulcrum shaft. And a plurality of oscillating frames 79 functioning as urging force transmitting members.
As shown in FIGS. 7, 9, and 10, the plurality of attachment portions 31 are provided at one end of the plurality of swing frames 79, and the plurality of biasing members 95 are the other ends of the plurality of swing frames 79. Is provided. The common fulcrum shaft 53 is located on the side where the mounting portions 31 of the plurality of swing frames 79 are located and at a position away from the mounting portions 31. The plurality of urging members 95 are individually provided between the support base body 74 and each swing frame 79.
In other words, the common fulcrum shaft 53 is positioned on one end D side of each of the plurality of oscillating frames 79 to which the pressing member 23 is attached, and the attachment portion 31 is the oscillating frame at the tip of the common fulcrum shaft 53. 79 is provided at the end of one end D side. A plurality of urging members 95 having different urging forces are individually provided between the support base body 74 on the other end E side of the common fulcrum shaft 53 and the swing frames 79.

In the present embodiment, the support base body 74 is rotated about the rotation shaft 81, and the swing frame 79 is a position where the pressing member 31 is pressed against the pressing object 24 by the rotation (second swing described later). Swings toward (position). Thereby, the pressing member 31 is pressed against the pressing target 24 with the pressing force F.
As an example, the support base body 74 is integrally provided so as to be sandwiched between two side plate portions 75 and 75 formed of a metal flat plate member and the two side plate portions 75 and 75. And a main body 77 formed of a block member made of hard plastic.
A bearing portion 83 that receives the rotating shaft 81 of the support base body 74 is provided at a portion near the tip of the two side plate portions 75 and 75 and the main body portion 77 arranged on the left and right. The rotating shaft 81 is provided on the one end D side to which the pressing member 23 is attached, and on the other end E side of the common fulcrum shaft 53. The support base body 74 is provided to be rotatable between a nip position where the pressing member 23 is in contact with the pressing target 24 and further pressed and a release position separated from the pressing member 23 around the rotation shaft 81. ing.

In addition, the rear end portions of the left and right side plate portions 75 and 75 are formed with window portions 85 and 85 having a rounded rectangular shape as an example, and the window portions 85 and 85 are formed at the rear end portion of the main body portion 77. An engagement groove 87 (FIG. 4) having a predetermined depth along the inclination is formed.
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, 85 at both ends. As an example, an engagement hole 91 having a hexagonal cross section is formed at the position so as to extend in the longitudinal direction. Then, the rotation drive shaft 93 is inserted into the engagement hole 91 to transmit the power, thereby realizing the rotation of the entire support base body 74 around the rotation shaft 81 at a predetermined angle. Switching between position and release position.

A locking shaft 97 for locking one end of an urging member 95, which is a constituent member of the pressing force generating mechanism 41 described later, is arranged in the width direction B on the upper part of the rear end portions of the left and right side plate portions 75, 75. It is attached to extend.
In this embodiment, the swing frame 79 is provided with two types, a first swing frame 79A having a large width dimension and a second swing frame 79B having a smaller width dimension than the first swing frame 79A. Yes.

These swing frames 79A and 79B are composed of bottom plate portions 99A and 99B and side plate portions 101A and 101A or side plate portions raised upward from left and right side edges in the width direction B of the bottom plate portions 99A and 99B. 101B, 101B, and locking pieces 103A, 103B for locking the other ends of the urging members 95A, 95B.
In addition, a hole for receiving the second engagement shaft portion 53 serving as a common fulcrum shaft is formed at a position near the tip of the left and right side plate portions 101A, 101A or 101B, 101B. It extends so that the both ends of the 2nd engaging shaft part 53 may protrude in the left-right outward.

The width dimension of the bottom plate portion 99A in the first swing frame 79A is such that the left and right side plate portions 75, 75 and the main body portion 77 constituting the support base body 74 are replaced with the left and right side plate portions 101A in the swing frame 79A. , 101A is set to a size that can be accommodated.
Further, the width dimension of the bottom plate portion 99B in the second swing frame 79B is set to a dimension that fits within a recess 77a (FIGS. 6 and 11) formed in the bottom portion of the main body portion 77 of the support base body 74.

And the 1st engagement shaft used as the attachment part 27 as the attachment part 31 in the edge part of the one end D side of the front-end | tip of these rocking | fluctuation frames 79A and 79B. As an example of engagement with the portion 47, a second engagement groove 51 formed by a U-shaped groove is provided.
The second engagement groove 51 includes an opening 105 for allowing the first engagement shaft portion 47 serving as the attached portion 27 to enter the groove, and a pressing force against the conveyance drive roller 13 serving as the pressing target 24. A pressing action wall 107 for transmitting F to the transport driven roller 15 and an entry guide wall 109 for guiding the entry of the first engagement shaft portion 47 are 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 facilitate removal of the pressing member 23.

  In the present embodiment, the swing frames 79A and 79B have a first swing position L that is taken in a state in which the pressing member 23 is not in contact with the pressing target 24, and the pressing member 23 is in contact with the pressing target 24 and is further pressed. The second engagement shaft portion 53 serving as a common fulcrum shaft can be oscillated between the second oscillating position M taken when pressed against the second oscillating position 24.

In the first swing frame 79A, the first swing position L is such that the lower end on the other end E side of the left and right side plate portions 75, 75 of the support base body 74 is the bottom plate portion 99A of the first swing frame 79A. It is set by abutting on the upper surface.
On the other hand, in the second swing frame 79B, a convex portion 77b protruding downward from a concave portion 77a formed on the bottom portion on the other end E side of the main body portion 77 of the support base body 74 (FIG. 11). Is set by contacting the upper surface of the bottom plate portion 99B of the second swing frame 79B.
A plate-like cam lever 123 that functions as a cam follower is further extended rearwardly at the rear end of the second swing frame 79B having a small width. The cam lever 123 is a member constituting an individual switching mechanism 122 described later, and a specific operation mode thereof will be described later.

In this embodiment, the support base body 74 rotates in the pressing direction with the rotation shaft 81 as a fulcrum, and the pressing member 23 is restricted from moving in the same direction after contacting the pressing target 24, thereby The movement frames 79A and 79B cause the support base body 74 to move in the direction opposite to the rotation direction with respect to the common fulcrum shaft 53, and the movement in the opposite direction causes the urging force of the urging member 95 to act. A pressing force F is generated.
In other words, the support base body 74 is in a state immediately before reaching the nip position where the pressing member 23 comes into contact with the pressing object 24 and is pressed with a predetermined pressing force F, and the pressing member 23 is pressed against the pressing object 24. It is comprised so that the contact start position N which starts contact | abutting may be taken.
The contact T between the attachment portion 31 and the attachment portion 27 is rotated clockwise with respect to the common fulcrum shaft 53 by the rotation after the support base body 74 reaches the contact start position N. The swing frames 79A and 79B are configured to swing and shift from the first swing position L to the second swing position M.

Further, in this embodiment, the urging member 95 is a tension coil spring, and the pressing unit 25 presses the pressing member 23 against the pressing object 24, whereby the swing frames 79A and 79B cause the tension coil spring to move around the common fulcrum shaft 53. The urging force is rotated in the extending direction, and an urging force is generated by the stretching. The urging force is transmitted to the pressing member 23 as a pressing force F.
Here, the first pressing force generation mechanism 41A that applies a relatively large pressing force F2 to the transport driven roller 15B and the second pressing force generation mechanism 41B that applies a relatively small pressing force F1 to the transport driven roller 15A. Two systems of pressing force generation mechanisms 41 are provided.
Among these, the first pressing force generating mechanism 41A includes first urging members 95A and 95A configured by two tension coil springs having a large urging force, and a first swing frame 79A that functions as an urging force transmitting member. ing.
On the other hand, the second pressing force generation mechanism 41B includes a second urging member 95B configured by one tension coil spring having a small urging force, and a second swing frame 79B that functions as an urging force transmission member. .

Then, the urging force generated by the first urging member 95A is transmitted to the pressing member 23B via the first swing frame 79A, and compared with, for example, 100 N with respect to the conveying driven roller 15B of the pressing member 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 pressing member 23A via the second swing frame 79B, and compared with, for example, 25N with respect to the conveying driven roller 15A of the pressing member 23A. A small pressing force F1 is transmitted.

That is, when the pressing unit 21 according to the present embodiment presses the pressing member 23 against the pressing target 24, the swing frame 79 rotates in the direction in which the tension coil spring 95 is extended around the common fulcrum shaft 53, and this extension causes the spring force. The spring force is transmitted as a pressing force F to the pressing member 23.
Therefore, the pressing force F is generated in a state where the pressing member 23 is pressed against the pressing target 24, and the pressing member 23 is not pressed against the pressing target 24 (separated state or simply contacting). In the state), the pressing force F is not generated.

In this embodiment, the pressing action position (contact position with the pressing target 24) G at which the pressing member 23 contacts the pressing target 24 is located farther from the attachment portion 31 with respect to the common fulcrum shaft 53.
That is, the pressing action position (contact position with the pressing target 24) G at which the pressing member 23 contacts the pressing target 24 is positioned closer to the one end D side of the tip than the contact T between the mounting portion 31 and the mounting portion 27. Is set to
Incidentally, when the pressing action position G is set at such a position, when the pressing member 23 attached to the pressing unit 25 is pressed against the pressing object 24 with a predetermined pressing force F, the pressing action acting on the pressing action position G is applied. The reaction force of the force F acts in the direction of increasing the engagement between the first engagement groove portion 49 and the second engagement shaft portion 53 with the contact point T between the attachment portion 31 and the attachment portion 27 as a fulcrum. . Accordingly, it is possible to reduce the dropping of the pressing member 23 from the pressing unit 25.

In addition, the pressing unit 21 according to the present embodiment includes a leaf spring-like pressing plate 121 that functions as the rotation promoting structure 111 at a position near the tip in the one end D direction of the bottom plate portion 99B of the second swing frame 79B. However, three are provided as an example in a state of being inclined so that the front becomes higher.
The rotation promoting structure 111 is formed on the pressing member 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. 5 has a role of promoting rotation in the direction indicated by the arrow C in FIG.

  Further, as shown in FIG. 3, at the tip position in the one end D direction of the bottom plate portion 99B of the second swing frame 79B, there is a guide guide portion 62 constituted by an inclined surface formed by folding back the extended portion. Is provided. The guide guide portion 62 prevents the engaging portion 45 b of the pressing member 23 from being caught by the large diameter portion 54 at the center of the second engaging shaft portion 53 when the pressing member 23 is attached to the pressing unit 25. It is responsible for guidance.

(3) Operation mode of the pressing unit (see FIGS. 5 to 8)
The operation mode when the pressing unit 21 according to the present embodiment is shifted from the release position to the nip position is as follows.
When the rotation drive shaft 93 is rotated in a predetermined direction and power is transmitted to the engagement piece 89, the support base body 74 obtains a displacement amount corresponding to the eccentric amount of the engagement piece 89 and centers on the rotation shaft 81. It rotates by a predetermined angle toward the nip position. When the support base body 74 reaches from the release position L shown in FIG. 5 to the contact start position N shown in FIG. 6, the transport driven roller 15 of the pressing member 23 attached to the pressing unit 25 sandwiches the medium P. It abuts on the conveyance drive roller 13 that is the pressing object 24.

Although the rotation of the support base 74 further proceeds, the movement of the transport driven roller 15 is restricted because the transport driven roller 15 is in contact with the transport drive roller 13.
As a result, the pressing member 23 starts to rotate clockwise in FIGS. 7 and 8. That is, the pressing member 23 has a common fulcrum and a first engagement shaft portion 47 that becomes the attached portion 27 with a nip point (becomes the pressing action position G) between the conveyance driven roller 15 and the conveyance driving roller 13 as a fulcrum. The first engagement groove portion 49 engaged with the second engagement shaft portion 53 serving as the shaft is pushed down (broken state).

  Then, with the downward movement of the first engagement shaft portion 47 serving as the attached portion 27, the swing of the swing frame 79 that functions as an urging force transmission member starts. That is, the swing frame 79 receives a force that pushes the pressing action wall 107 upward from the contact point T between the mounted portion 27 and the mounting portion 31, and therefore swings with the second engagement shaft portion 53 serving as a common fulcrum shaft as a fulcrum. The locking piece 103 provided on the other end E side of the swing frame 79 is moved downward.

As a result, the distance between the locking piece 103 and the locking shaft 97 is widened, so that the tension coil spring 95 stretched between the locking piece 103 and the locking shaft 97 is stretched. The urging force of the tension coil spring 95 generated by the stretching is transmitted from the locking piece 103 to the swing frame 79 that is a biasing force transmission member, and is provided at the end of the swing frame 79 on the one end D side. It is transmitted from the pressing action wall 107 of the attachment part 31 to the first engagement shaft part 47 which is the attached part 27, and a pressing force F is applied to the pressing action position G.
In addition, the common fulcrum shaft 53 is pushed downward by the above-described rotation that causes the pressing member 23 to be bent. As a result, the support base body 74 slightly rotates counterclockwise in FIGS. 7 and 8, but the engagement piece 89 is engaged with the engagement groove 87 in a rotatable state. The drive shaft 93 is not subjected to a load associated therewith.

(4) Configurations of individual switching mechanisms and operating bodies, and operating modes thereof (see FIGS. 2, 7, 8, and 12)
As shown in FIG. 2, a plurality of pressing units 25 according to the present embodiment are arranged in the width direction B with appropriate intervals. A part of the plurality of pressing units 25 has a pressing member 23B attached to the first attachment portion 31A connected to the first pressing force generating mechanism 41A having a strong pressing force F.
On the other hand, all or a part of the other parts of the plurality of pressing units 21 is attached with the pressing member 23A to the second mounting portion 31B connected to the second pressing force generating mechanism 41B having a weak pressing force F. . Incidentally, in the illustrated embodiment, a pressing member 23B capable of applying a strong pressing force F2 is attached to the pressing units 25 at both ends in the width direction B, and is weak against the pressing unit 25 at the intermediate portion. The pressing member 23A that can apply the pressing force F1 is attached.

In the present embodiment, the nip position where the pressing member 23A is brought into contact with the pressing target 24 and the release position where the pressing member 23A is separated from the pressing target 24 are individually set for the second pressing force generating mechanism 41B. A separate switching mechanism 122 that enables switching is provided.
Each switching mechanism 122 is configured to receive power from a single operating body 126 and operate simultaneously.

The switching mechanism 122 is configured by a plate-like cam lever 123 that functions as a cam follower and is further extended rearward from the end portion on the other end E side of the second swing frame 79B. Further, the operating body 126 is constituted by a camshaft 127 attached to the swing shaft 125 in an eccentric state, and the length of the camshaft 127 pushes the cam levers 123 of all the pressing units 21 simultaneously. Is set to a length that can be
As shown in FIGS. 2 and 12, a pinion gear 133 is attached to one end of the swing shaft 125. When the shift lever 139 is rotated in a predetermined direction, the movement is transmitted to the sector gear 135 via the link arm 137, and the pinion gear 133 meshing with the sector gear 135 is rotated to drive the camshaft 127. It is configured.

The operation modes of the switching mechanism 122 and the operating body 126 configured as described above are as follows.
That is, when the pressing member 23A at the nip position is moved to the release position, the shift lever 139 is operated to rotate the swing shaft 125 by a predetermined angle in a predetermined direction. As a result, the contact position of the camshaft 127 changes, and the cam lever 123 is pushed downward by a stroke corresponding to the cam height of the camshaft 127.
When the cam lever 123 is pushed down, the second swing frame 79B swings in the clockwise direction in FIGS. 7 and 8 with the second engagement shaft portion 53 serving as a common fulcrum shaft as a fulcrum.

As the second swing frame 79B swings, the attachment portion 31 provided at the end on the one end D side of the second swing frame 79B moves upward, so that the second swing frame 79B is pressed through the attached portion 27. Power is transmitted to the member 23A.
As a result, the pressing member 23A rotates clockwise in FIG. 8 with the contact point between the second engagement shaft portion 53 and the first engagement groove portion 49 serving as a common fulcrum shaft as a fulcrum, and the nip position To the release position.

In this case, the second swing frames 79B of all the pressing units 21 swing simultaneously, but no power is transmitted to the first swing frames 79A provided at both ends in the width direction B. Therefore, power is not transmitted to the pressing member 23B attached to the first swing frame 79A to the pressing unit 21, and therefore still remains in the nip state.
Incidentally, such an operation mode is adopted in the case where the medium P after recording is back-feeded. Since the pressing member 23A is in the release position in the intermediate portion of the medium P, the pressing member 23A is the medium. No contact with P recording surface. Therefore, the recording surface of the medium P is not damaged.
On the other hand, even if a strong pressing force F2 is applied to both edges of the medium P, damage to the medium P does not matter so much. In addition, a good back feed of the medium P is realized by the strong pressing force F2.

[Other Embodiments]
The pressing unit 21 and the liquid ejection device 1 according to the embodiment of the present invention are basically configured to have the above-described configuration, but the partial configuration is changed without departing from the gist of the present invention. Of course, it is possible to omit or omit them.
For example, the relationship between the “engagement shaft portion” and the “engagement groove portion” applied to the attachment portion 27 and the attachment portion 31 is reversed from that of the above embodiment, and the attachment portion 27 is configured by the “engagement groove portion”. The attaching portion 31 can be constituted by an “engaging shaft portion”.

Further, instead of the engagement structure as in the above embodiment, the fastening structure of the attached portion 27 and the attachment portion 31 employs a fastening structure that is attached with screws, or a combination of spring force and magnetic force by a magnet in the engagement structure. It is also possible to employ a complex mounting structure.
In the above embodiment, the pressing member 23 is applied with the driven roller 15 for conveyance. However, the driving roller 13 for conveyance may be applied, or the medium P may be formed by a conveyance belt having an adhesive layer formed on the surface. Can be applied to a roller used for the purpose of sticking the medium P to the surface of the transport belt, other sticking members, or the like.

In the above-described embodiment, the two pressing force generation mechanisms 41 are provided to switch between two types of pressing forces F. However, more than one type of pressing force F is provided by providing three or more pressing force generation mechanisms 41. It is also possible to configure so as to switch.
Furthermore, the pressing unit 21 of the present invention is not limited to the liquid ejection apparatus 1 such as the ink jet printer described in the above embodiment, but transports other types of recording apparatuses such as laser printers and copying machines, and sheet-like transported objects. The present invention can be applied to various transport apparatuses.
Further, the pressing action position G can be provided at an appropriate position near the contact T, such as a position below the contact T, in addition to being provided on the tip side of the contact T of the attachment portion 31 and the attachment portion 27.

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 inks, oil-based inks, and electromagnetic wave curable inks that are 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 pressing unit 25 according to the first aspect of the present invention is a pressing unit 25 used for pressing the pressing member 23 against the pressing target 24, and includes a plurality of mounting portions 31 to which the pressing member 23 is detachably mounted, And a pressing force generating mechanism 41 that generates different pressing forces F on the part 31.

According to this aspect, the pressing force F of the pressing member 23 can be changed by changing the mounting position of the pressing member 23. Therefore, the pressing force F can be switched easily and in a short time.
Further, since the pressing member 23 is detachable so that the mounting position of the pressing member 23 can be selected, the pressing force F is changed according to the width dimension of the medium P to be used or the pressing member 23 at an unnecessary portion is removed. Work and the like can be performed easily and quickly.

  The pressing unit 25 according to the second aspect of the present invention is the pressing unit 25 according to the first aspect, wherein the pressing force generating mechanism 41 is mounted by separately receiving a plurality of different biasing members 95 and the biasing forces of the plurality of biasing members 95. A plurality of urging force transmission members 79 that transmit to the portion 31, and the urging force is transmitted by the urging force transmission member 79 to which the pressing member 23 is attached when the pressing unit 21 presses the pressing member 23 against the pressing target 24. Is transmitted to the attachment portion 31 to generate a pressing force F.

According to this aspect, a plurality of systems of pressing force generation mechanisms 41 including the urging member 95 and the urging force transmission member 79 are provided, and the pressing force F generated by these pressing force generation mechanisms 41 corresponds. Is transmitted to the attachment portion 31 to be performed. Therefore, the configuration of the pressing force generating mechanism 41 is simplified, and the efficient pressing force F can be transmitted.
Further, since the pressing force F of the pressing member 23 is generated by pressing the pressing member 23 against the pressing target 24, when the pressing member 23 is in the release position, the urging force transmitting member 79 is operated. A large urging force from the urging member 95 that is required is not applied. Therefore, the pressing force generating mechanism 41 can be used efficiently, and the durability of the biasing member 95 is improved.

  The pressing unit 25 according to the third aspect of the present invention includes, in the second aspect, a support base 74 body and a plurality of swing frames 79 that are swingably connected to the support base body 74 via the common fulcrum shaft 53. The plurality of attachment portions 31 are provided at one end of the plurality of swing frames 79, and the plurality of biasing members 95 are provided at the other end of the plurality of swing frames 79, and a common fulcrum shaft 53 is provided. Is located on the side where the attachment portions 31 of the plurality of swing frames 79 are located and away from the attachment portions 31, and the plurality of biasing members 95 include the support base body 74 and the swing frames 79. It is characterized by being provided individually between the two.

According to this aspect, the pressing unit 25 is configured by connecting the support base body 74 and the plurality of swing frames 79 in a rotatable state by the common fulcrum shaft 53. Accordingly, the plurality of swing frames 79 can swing independently of the support base body 74 with the common fulcrum shaft 53 as a fulcrum.
Further, by adopting an arrangement mode in which the attachment portion 31 is disposed on the front end side of the common fulcrum shaft 53 and the biasing member 95 is disposed on the rear end side of the common fulcrum shaft 53, the attachment portion 31 is located upward. As a result, the urging force of the urging member 95 is generated. This urging force is transmitted to the swing frame 79 which is an urging force transmission member, and a predetermined pressing force F is applied to the pressing member 23 via the mounting portion 31 and the mounted portion 27.
In this embodiment, since the common fulcrum shaft 53 is positioned on the one end D side of the swing frame 79, the displacement amount of the rear end portion of the swing frame 79 accompanying the swing of the swing frame 79 increases. The range of the urging force generated by the urging member 95 can be increased.

  In the pressing unit 25 of the fourth aspect of the present invention, in the third aspect, the swing frame 79 has a first swing position L that is taken in a state where the pressing member 23 is not in contact with the pressing target 24, and the pressing member 23. Is swingable about the common fulcrum shaft 53 as a fulcrum between the second swing position M and the second swing position M in a state of being pressed against the pressing object 24 by the pressing force F.

  According to this aspect, the swing range of the swing frame 79 is the first swing position L that is taken when the pressing member 23 is in the release position, and the second swing position that is taken when the pressing member 23 is in the nip position. It is regulated within the range of M. Therefore, excessive swinging of the swing frame 79 is prevented, and the swing operation of the swing frame 79 is stabilized.

  In the pressing unit 25 according to the fifth aspect of the present invention, in the fourth aspect, the support base body 74 rotates about the rotation shaft 81, and the swing frame 79 is moved to the second swing position M by the rotation. And the pressing member 23 is pressed against the pressing object 24 with a pressing force F.

  According to this aspect, the support base body 74 rotates around the rotation shaft 81 and can switch between the nip position and the release position. When the support base body 74 is rotated, the whole is rotated with the swing frame 79 and the pressing member 23. Therefore, when a plurality of pressing units 21 are provided, the nips of all the pressing units 21 are provided. Switching between the position and the release position can be performed simultaneously.

  In the pressing unit 25 of the sixth aspect of the present invention, the supporting base body 74 rotates in the pressing direction with the rotating shaft 81 as a fulcrum, and the pressing member 23 contacts the pressing object 24 in the fifth aspect. Since the movement in the same direction is restricted, the swinging frame 79 causes the support base body 74 to move in the direction opposite to the rotation direction with respect to the common fulcrum shaft 53, and the movement in the reverse direction causes the swinging frame 79 to move. The urging force of the urging member 95 is applied, and the pressing force F is generated.

  According to this aspect, a force for displacing the mounting portion 31 provided at the front end portion of the swing frame 79 is acted upward, and the rear end portion of the swing frame 79 is displaced downward to urge the member. The urging force of 95 can be generated, and the pressing force F corresponding to the urging force can be applied to the pressing member 23.

  In the pressing unit 25 of the seventh aspect of the present invention, in any one of the third to sixth aspects, the urging member 95 is a tension coil spring, and the pressing unit 25 presses the pressing member 23. 24, the swing frame 79 rotates about the common fulcrum shaft 53 in the direction in which the tension coil spring is extended, and an urging force is generated by the extension, and the urging force becomes the urging force F and the urging member 23. It is transmitted to.

  According to this aspect, the tension coil spring 95 is extended by a predetermined stroke due to the swing of the swing frame 79 caused by the pressing member 23 being pressed against the pressing target 24. Along with this, the biasing force in the direction in which the tension coil spring 95 tends to contract increases, and the pressing force F corresponding to the increase in the biasing force acts on the pressing member 23. Further, by using the tension coil spring 95 as the biasing member 95, a large biasing force can be obtained with a relatively simple configuration.

  In the pressing unit 25 according to the eighth aspect of the present invention, in any one of the third to seventh aspects, the pressing action position G at which the pressing member 23 contacts the pressing target 24 is located on the common fulcrum shaft 53. On the other hand, it is located away from the attachment portion 31.

  According to this aspect, when the pressing member 23 attached to the pressing unit 25 is pressed against the pressing target 24 with the predetermined pressing force F, the reaction force of the pressing force F acting on the pressing action position G is With the contact point T between 31 and the attached portion 27 as a fulcrum, the engagement between the first engagement groove portion 49 and the second engagement shaft portion 53 is enhanced. Thereby, it is possible to reduce inadvertent dropping of the pressing member 23 from the pressing unit 25.

  The liquid ejection apparatus 1 according to the ninth 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. The transport unit 11 transports the medium P toward the liquid discharge region 17 by the transport unit 11. The transport unit 11 includes the pressing unit 25 and the pressing member 23 according to any one of the first to eighth modes. And the pressing member 23 is characterized by being a transport driving roller 13 or a transport driven roller 15.

According to this aspect, for example, the operation of switching the pressing force F of the transport driven roller 15 or the like can be performed easily and quickly. Further, productivity can be improved because it is possible to quickly cope with the difference in the width dimension of the medium P.
Accordingly, the switching operation of the pressing force F of the transport driven roller 15 corresponding to the difference in the width dimension and property of the medium P or the transport mode of the medium P such as the back feed described above can be smoothly performed.

  The liquid ejection apparatus 1 according to the tenth aspect of the present invention is the liquid ejection apparatus 1 according to the ninth aspect, wherein a plurality of pressing units 25 are arranged at appropriate intervals in the width direction B. The pressing member 23 is attached to the first mounting portion 31A connected to the first pressing force generating mechanism 41A having a strong pressing force F, and all or a part of the other portions of the plurality of pressing units 25 are: The pressing member 23 is attached to the second attachment portion 31B connected to the second pressing force generation mechanism 41B having a weak pressing force F.

According to this aspect, since a plurality of the pressing units 25 are disposed, various widths of the medium P can be handled. Further, with respect to the wide medium P, it is possible to realize stable conveyance of the medium P while reducing damage to the medium P by disposing a large number of pressing units 25 having a weak pressing force F.
On the other hand, with respect to the pressing unit 25 that acts on both edges of the medium P that is less affected by the damage to the medium P, the pressing force F is increased so that the influence of the damage acting on the medium P becomes a problem in the middle part of the medium P. The pressing unit 25 that acts can be arranged such that the pressing force F is weakened.

  According to an eleventh aspect of the liquid ejection apparatus 1 of the present invention, in the tenth aspect, the second pressing force generation mechanism 41B presses the pressing member 23A and a nip position where the pressing member 23A comes into contact with the pressing target 24. There is provided a switching mechanism 122 that enables individual switching between a release position separated from the object 24 and each switching mechanism 122 is configured to receive power from a single operating body 126 and operate simultaneously. It is characterized by being.

According to this aspect, the switching operation between the nip position and the release position, which has been conventionally performed for each pressing unit 21, can be switched for each pressing force generation mechanism 41. Accordingly, the pressing unit 21 having a strong pressing force F arranged at both edges of the medium P is set to the nip position, and the pressing unit 21 having a weak pressing force F arranged to the middle part of the medium P is set to the release position. The work can be performed at once by turning the single operating body 126.
Therefore, when the medium P after execution of recording is back fed, the recording surface of the medium P can be smoothly back fed without damaging it.

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, 16 Roller for discharge, 17 Liquid discharge area,
18 feeding part, 19 winding part, 20 guide roller, 23 pressing member,
24 pressing object, 25 pressing unit, 27 attached part,
29 pressing side movement restricting portion, 31 mounting portion, 33 base side movement restricting portion,
35 heater, 37 sensor, 39 heating unit, 41 pressing force generation mechanism,
43 shaft part, 45 holder part, 45a body part, 45b engagement part,
47 first engagement shaft portion, 49 first engagement groove portion, 50 gap portion, 51 second engagement groove portion,
53 second engagement shaft portion (common fulcrum shaft), 54 large diameter portion, 55 opening portion, 57 first restriction wall,
59 second restriction wall, 61 guide section, 62 guide section, 65 connection structure,
65a engagement hole, 74 support base body, 75 side plate portion, 77 body portion, 77a recess,
77b Convex part, 79 Oscillating frame (urging force transmission member), 81 Rotating shaft, 83 Bearing part,
85 window portion, 87 engagement groove, 89 engagement piece, 91 engagement hole, 93 rotation drive shaft,
95 biasing member (tensile coil spring), 97 locking shaft, 99 bottom plate, 101 side plate,
103 locking pieces, 105 openings, 107 pressing action walls, 109 approach guide walls,
111 rotation promotion structure, 121 holding plate, 122 switching mechanism,
123 Cam lever, 125 Oscillating shaft, 126 Actuator, 127 Camshaft,
133 pinion gear, 135 fan gear, 137 link arm,
139 Shift lever, P medium, O fulcrum, A transport direction, B width direction,
F pressing force, X engagement direction, Z engagement direction, C arrow, Q fulcrum, D one end,
E other end, L first swing position, M second swing position, N contact start position, T contact,
G Pressing action position

Claims (9)

A pressing unit that is provided in a transport unit that transports a medium by a roller pair, and is used to press one roller as a pressing member against the other roller as a pressing target among the roller pair,
A plurality of attachment parts to which the pressing member is detachably attached;
A plurality of different urging members, and a plurality of urging force transmitting members that individually receive the urging forces of the plurality of urging members and transmit the urging forces to the mounting portion, and the pressing unit applies the pressing member to the pressing target. A pressing force generation mechanism that generates a pressing force by transmitting the urging force to the attachment portion by the urging force transmission member to which the pressing member is attached by being pressed,
A support base body, and a plurality of swing frames that are swingably connected to the support base body via a common fulcrum shaft,
The plurality of attachment portions are provided at one end of the plurality of swing frames,
The plurality of urging members are provided at the other ends of the plurality of swing frames,
The common fulcrum shaft is located on the side where the attachment portions of the plurality of swing frames are located and away from the attachment portions,
The pressing unit, wherein the plurality of urging members are individually provided between the support base body and each swing frame. The pressing unit according to claim 1 ,
The swing frame includes a first swing position that is taken when the pressing member is not in contact with the pressing target, and a second swing position that is pressed when the pressing member is pressed against the pressing target by the pressing force. A pressing unit characterized in that it can swing around the common fulcrum shaft as a fulcrum. The pressing unit according to claim 2 ,
The support base body rotates about a rotation shaft, and the swing frame swings toward the second swing position by the rotation, and the pressing member presses against the pressing target with the pressing force. A pressing unit characterized by being The pressing unit according to claim 3 ,
The support base body rotates in the pressing direction with the rotating shaft as a fulcrum, and the pressing member is restricted from moving in the same direction after coming into contact with the object to be pressed. The support base body moves in a direction opposite to the rotation direction with respect to the fulcrum shaft, and the biasing force of the biasing member acts by the movement in the reverse direction, and the pressing force is generated. The pressing unit. In the pressing unit according to any one of claims 1 to 4 ,
The biasing member is a tension coil spring;
When the pressing unit presses the pressing member against the target to be pressed, the swing frame rotates in the direction of extending the tension coil spring around the common fulcrum shaft, and an urging force is generated by the extension, and the urging force is A pressing unit that is transmitted to a pressing member as a pressing force. In the pressing unit according to any one of claims 1 to 5 ,
The pressing unit, wherein the pressing member is in contact with the object to be pressed, and is located farther than the mounting portion with respect to the common fulcrum shaft. 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 unit that transports a medium toward a liquid discharge region by the liquid discharge head by a roller pair including a transport driving roller and a transport driven roller ;
Liquid The conveyance section, of the roller pair, is used to press one of the rollers to the other roller, characterized by the Turkey includes a unit pressing according to any one of claims 1 to 6 Discharge device. The liquid ejection device according to claim 7 , wherein
A plurality of the pressing units are arranged at an appropriate interval in the width direction of the medium support portion,
A part of the plurality of pressing units has the pressing member attached to a first mounting portion connected to a first pressing force generating mechanism having a strong pressing force,
All or a part of the other parts of the plurality of pressing units is characterized in that the pressing member is attached to a second attachment part connected to a second pressing force generating mechanism having a weak pressing force. Liquid ejection device. The liquid ejection apparatus according to claim 8 , wherein
The second pressing force generation mechanism is provided with a switching mechanism that can individually switch between a nip position where the pressing member abuts against the pressing target and a release position where the pressing member separates from the pressing target. And
Each of the individual switching mechanisms of the second pressing force generating mechanism operates simultaneously upon receiving power from a single operating body.

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