JP2011088299A - Head maintenance device, and liquid jetting device including the head maintenance device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head maintenance device sealing a head surface of a liquid jetting head in a sufficient and stable tight-contact state regardless of an opening/closing state of an atmosphere communicating path, by an inexpensive constitution. <P>SOLUTION: In an atmosphere opening valve unit 70, an operation shaft body 95 of a push latch mechanism part 90 displaces in an operating direction E, whereby a rocking member 72 rocks in a rocking direction F, to allow a valve body supporting part 74 to move back and forth in an opening/closing direction G, and a valve body 743 elastically deforms in a direction in which it comes in contact with/separates from an inner peripheral surface of a valve seat part 75. In such a state that a center portion of the valve body 743 separates from the inner peripheral surface of a valve seat 753, the atmosphere opening valve unit 70 becomes in an open state through a closed space formed between the inner peripheral surface of the valve seat 753 and the valve body 743. In such a state that the center portion of the valve body 743 comes into surface-contact with the inner peripheral surface of the valve seat 753 and is seated, a first through-hole 754 and a second through-hole 755 are blocked by the valve body 743, so that the atmosphere opening valve unit 70 gets in a closed state. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a head maintenance device that maintains a liquid ejecting head of a liquid ejecting apparatus that ejects liquid onto a material to be ejected from a liquid ejecting nozzle provided on a head surface of the liquid ejecting head.

Here, the liquid ejecting apparatus refers to an ink jet recording apparatus, a copying machine, a facsimile, or the like that performs recording on a recording paper by ejecting ink from a liquid ejecting head such as a recording head onto an ejected material such as recording paper. The present invention is not limited to this, and includes a device that ejects a liquid corresponding to a specific application from a liquid ejecting head onto a material to be ejected and attaches the liquid to the material to be ejected instead of ink.
In addition to the recording head described above, the liquid ejecting head includes a color material ejecting head used for manufacturing a color filter such as a liquid crystal display, an electrode material used for forming an electrode such as an organic EL display and a surface emitting display (FED) ( Examples thereof include a conductive paste) ejection head, a bio-organic matter ejection head used for biochip manufacturing, and a sample ejection head that ejects a sample as a precision pipette.

  In order to maintain the head surface of a recording head (liquid ejecting head) in a good state at all times, a known ink jet printer as an example of a liquid ejecting apparatus is used to maintain the recording head during standby and during recording execution. In general, a head maintenance device is provided. As one of the main functions of this head maintenance device, the head surface of the recording head is sealed with a sealing member during standby to prevent ink from the ink ejection nozzles provided on the head surface from drying. Has a function to prevent nozzle clogging. Specifically, a mechanism is provided that seals the head surface by bringing a sealing member into close contact with the head surface of the recording head during standby, and separates the sealing member from the head surface of the recording head during recording.

  Furthermore, one of the main functions of the head maintenance device is formed between the head surface of the recording head and the sealing surface of the sealing member in a state where the head surface of the recording head is sealed with the sealing member. There is a function of generating a negative pressure in the closed space and sucking ink in the ink ejection nozzle by the negative pressure. Specifically, a suction path communicating with the sealing surface of the sealing member, a pump capable of sucking the suction path, an air communication path for communicating the sealing surface of the sealing member with the atmosphere, and opening and closing the air communication path The valve mechanism for this is provided (for example, refer patent documents 1-3).

  In the head maintenance device having such a configuration, two types of suction operations can be performed according to the purpose. The two types of suction operations described below can be selected depending on whether the suction operation is performed with the atmosphere communication path open or the suction operation is performed with the atmosphere communication path closed.

  One is a suction operation in which the head surface of the recording head is sealed with the sealing surface of the sealing member, and the suction pump is operated in a state where the atmosphere communication path is closed (hereinafter referred to as “main suction operation”). . The main purpose of the main suction operation is to forcibly discharge ink, bubbles, and the like from the ink ejection nozzle. In this suction operation, since the suction pump is operated with the atmosphere communication path closed, suction by a negative pressure generated in a closed space formed between the head surface of the recording head and the sealing surface of the sealing member is performed. A force can be applied in the ink jet nozzle. As a result, it is possible to prevent the ink ejection nozzles from clogging or missing dots due to bubbles in the ink ejection nozzles.

  The other is a suction operation in which the head surface of the recording head is sealed with the sealing surface of the sealing member, and the suction pump is operated with the atmosphere communication path opened (hereinafter referred to as “empty suction operation”). ). The main purpose of this empty suction operation is to suck the ink stored on the sealing surface of the sealing member and send it to a waste liquid tank or the like. In the idle suction operation, since the suction pump is operated with the atmosphere communication path opened, an appropriate negative pressure is applied to the closed space formed between the head surface of the recording head and the sealing surface of the sealing member. At the same time, the air can enter. As a result, the ink stored on the sealing surface of the sealing member is delivered to a waste liquid tank or the like while being sucked smoothly by the suction force of the suction pump.

  As an example of a conventional head maintenance device, a device in which a valve mechanism that opens and closes an atmosphere communication path operates in conjunction with a rising mechanism of a sealing member is known. Specifically, in a state where the sealing member is moved to the position where the head surface of the recording head is sealed by the sealing surface, the valve is closed by the urging force of the urging means that engages the valve mechanism. The state where the communication path is closed is maintained. From that state, the supporting member of the sealing member is slightly moved in a direction away from the head surface within a range in which the sealed state of the head surface is maintained. Thereby, a part of the housing of the head maintenance device is engaged with the valve mechanism, and the valve is opened and the atmosphere communication path is opened (see, for example, Patent Document 1 or 2). As another example of a conventional head maintenance device, a device that opens and closes an air communication path using a solenoid valve is known (see, for example, Patent Document 3).

JP 2005-66852 A JP 2007-50602 A JP 2008-213463 A

  In the head maintenance device disclosed in Patent Document 1 or 2, although the sealing state of the head surface by the sealing member is in a range that is maintained, the supporting member of the sealing member is slightly moved away from the head surface. The empty suction operation is performed in the moved state. Therefore, in the idle suction operation, the adhesion between the head surface of the recording head and the sealing surface of the sealing member becomes insufficient or unstable, and the gap between the head surface of the recording head and the sealing surface of the sealing member There is a possibility that a sufficient negative pressure cannot be generated in the closed space formed at the bottom. On the other hand, the head maintenance device disclosed in Patent Document 3 has a structure in which the air communication path is opened and closed by a solenoid valve, and thus such a problem does not occur. However, since the solenoid valve is generally a very expensive part, if a structure in which the air communication path is opened and closed by the solenoid valve is employed, the cost of the head maintenance device may increase significantly.

  The present invention has been made in view of such a situation, and the problem to be solved by some aspects according to the present invention is that liquid injection is performed in a sufficiently and stable contact state regardless of the open / closed state of the air communication path. The object is to realize a head maintenance device capable of sealing the head surface of the head with a low-cost configuration.

  A first aspect of the present invention is a head maintenance device for maintaining the liquid ejecting head of a liquid ejecting apparatus that ejects liquid onto a material to be ejected from a liquid ejecting nozzle provided on a head surface of the liquid ejecting head, One or two or more maintenance units are supported by the apparatus base so as to be displaceable in a predetermined displacement direction that intersects the head surface of the liquid ejecting head, and the maintenance unit seals the head surface of the liquid ejecting head. A sealing member capable of stopping, a suction pump capable of sucking a suction passage communicating with the sealing surface of the sealing member, one side communicating with the sealing surface of the sealing member, and the other side opened to the atmosphere A head maintenance device having an atmosphere communication path, an atmosphere release valve capable of opening and closing the atmosphere communication path, and a push latch mechanism for performing an opening / closing operation of the atmosphere release valve.

  The atmosphere release valve that can open and close the atmosphere communication path can be switched between an open state and a closed state by a push latch mechanism. That is, every time the push latch mechanism is operated, the air release valve is alternately switched between an open state and a closed state. Further, since the push latch mechanism is a mechanism that self-holds the operation state, the open / close state of the air release valve is held by the push latch mechanism. Therefore, regardless of the sealing state of the head surface of the liquid jet head by the sealing member, the open / close state of the atmospheric communication path can be switched and the open / closed state can be maintained.

  As a result, according to the head maintenance device according to the first aspect of the present invention, the head maintenance device capable of sealing the head surface of the liquid ejecting head with a sufficient and stable contact state regardless of the open / closed state of the atmosphere communication path. Can be realized with a low-cost configuration.

  According to a second aspect of the present invention, in the head maintenance apparatus according to the first aspect described above, the maintenance unit has a reset mechanism capable of resetting a latch of the push latch mechanism. Device.

  The open / close state of the air release valve held by the push latch mechanism is alternately switched between an open state and a closed state each time the push latch mechanism is operated. Therefore, for example, if the number of times the push latch mechanism is operated is stored in the memory of the control circuit of the head maintenance device, the open / close state of the atmosphere release valve can be accurately specified. However, when the information stored in the memory is lost due to, for example, a power failure, the open / close state of the air release valve becomes unclear after the power is restored.

  For example, if a sensor that can detect the open / closed state of the air release valve is provided, it is not necessary to store the number of times the push latch mechanism is operated in the memory of the control circuit of the head maintenance device. However, it is possible to accurately identify the open / close state of the air release valve. However, if a sensor capable of detecting the open / closed state of the air release valve is provided, the cost of the head maintenance device will increase accordingly.

  The head maintenance device according to the second aspect of the present invention has a reset mechanism capable of resetting the latch of the push latch mechanism. That is, by operating the reset mechanism, the open / closed state of the air release valve can be forcibly shifted to a predetermined state. Accordingly, it is possible to accurately specify the open / close state of the air release valve in any case without providing a sensor capable of detecting the open / close state of the air release valve.

According to a third aspect of the present invention, there is provided a liquid ejecting apparatus that ejects liquid onto a material to be ejected from a liquid ejecting nozzle provided on a head surface of the liquid ejecting head, the first aspect or the second aspect described above. A liquid ejecting apparatus comprising the head maintenance device described above.
According to the third aspect of the present invention, in the liquid ejecting apparatus that ejects liquid from the liquid ejecting nozzle provided on the head surface of the liquid ejecting head to the material to be ejected, the first aspect or the first aspect described above. The effect by the invention described in the second aspect can be obtained.

The principal part top view of an inkjet printer. The principal part side view of an inkjet printer. The perspective view of a head maintenance apparatus. The front view of a head maintenance apparatus. The whole perspective view of a maintenance unit. The exploded perspective view of a unit base. The perspective view of the part in which the cap, the head guide, and the base member were provided. The disassembled perspective view of the part in which the cap, the head guide, and the base member were provided. The side view of the part in which the cap, the head guide, and the base member were provided. The perspective view which illustrated the engagement state of a cap and a base member. The perspective view and front view which illustrated the engagement state of a cap and a head guide. FIG. 6 is an operation explanatory diagram illustrating a recording head sealing operation and a sealing release operation. The perspective view of the part in which the head guide and the wiper unit were provided. The perspective view of a wiper unit. The disassembled perspective view of a wiper unit. The perspective view of a head guide. The perspective view which illustrated the modification of the wiper cleaner. The perspective view which illustrated the engaging part of a cam structure and a wiper unit. The principal part side view which expanded and illustrated the part in which the right cam structure was provided. The principal part perspective view of the sliding contact engagement part of a 1st wiper and a wiper cleaner. The principal part perspective view of the sliding contact engagement part of a 1st wiper and a wiper cleaner. The principal part perspective view of the sliding contact engagement part of a 1st wiper and a wiper cleaner. The principal part perspective view of the sliding contact engagement part of a 1st wiper and a wiper cleaner. The perspective view which looked at the air release valve unit from diagonally forward. The perspective view which looked at the air release valve unit from diagonally backward. The disassembled perspective view of an air release valve unit. The side view of the air release valve unit which carried out the cross section illustration of a part. The bottom view of the push latch mechanism part which carried out some cross-sectional illustrations. The disassembled perspective view of the push latch mechanism part which carried out some cross section illustration from the bottom face side. Operation | movement explanatory drawing which illustrated the push latch operation | movement typically. Operation | movement explanatory drawing which illustrated the reset operation typically. The perspective view which extracted and illustrated the part in which the driving force transmission mechanism was provided. The disassembled perspective view of the part in which the driving force transmission mechanism of the maintenance unit was provided. The perspective view of a driving force transmission mechanism. The perspective view which illustrated the planetary gear mechanism part of the driving force transmission mechanism. The perspective view which illustrated the meshing structure of the intermittent gear part of a rotary body, and a planetary gear. The bottom view which illustrated the meshing structure of the intermittent gear part of a rotary body, and a planetary gear. Operation | movement explanatory drawing which illustrated the operation state of the maintenance unit. 6 is a timing chart illustrating the control procedure of the head maintenance device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Configuration of inkjet printer 1>
First, the configuration of the inkjet printer 1 as a “liquid ejecting apparatus” will be described.
FIG. 1 is a plan view of a main part of the ink jet printer 1, and FIG. 2 is a side view of the main part.

  The ink jet printer 1 according to the present invention is a so-called line head type ink jet printer in this embodiment. The inkjet printer 1 includes a conveyance drive roller 11, a conveyance driven roller 12, a recording paper support member 13, a discharge drive roller 14, a discharge driven roller 15, and a plurality of units as means for executing recording on the recording paper P as an “ejecting material”. The recording head 16 is provided.

  The transport driving roller 11 has a high friction coating on the outer peripheral surface, and rotates by receiving the rotational driving force of a transport motor (not shown). The transport driven roller 12 is pivotally supported so as to be driven to rotate in a state of being biased in a direction in contact with the transport drive roller 11. The recording paper support member 13 supports the recording paper P from the back side. The distance between the head surface of the recording head 16 and the recording surface of the recording paper P (the surface on which recording is performed; the same applies hereinafter) is maintained at a constant interval by the recording paper support member 13. The discharge driving roller 14 is rotated by a rotational driving force of a conveyance motor (not shown) being transmitted. The discharge driven roller 15 is pivotally supported so as to be driven to rotate and is urged in a direction in which the discharge driven roller 15 contacts the discharge drive roller 14.

  A plurality of recording heads 16 as “liquid ejecting heads” are provided so that two rows of heads arranged at a certain interval in the width direction X (direction intersecting the transport direction YF) are configured in the transport direction YF. Yes. The recording heads 16 in the head row configured on the downstream side in the transport direction YF are provided at corresponding positions between the recording heads 16 in the head row configured on the upstream side in the transport direction YF. The plurality of recording heads 16 are provided such that the head faces the recording surface of the recording paper P supported by the recording paper support member 13. A number of ink ejection nozzles (liquid ejection nozzles) for ejecting ink (liquid) onto the recording surface of the recording paper P to form dots are disposed on the head surface of the recording head 16 (not shown). ).

  The recording paper P is sandwiched between the transport driving roller 11 and the transport driven roller 12 and is transported on the recording paper support member 13 in the transport direction YF by the driving rotation of the transport driving roller 11. The recording paper P on the recording paper support member 13 is ejected from the head surfaces of the plurality of recording heads 16 to the recording surface while being transported in the transport direction YF by a predetermined transport amount by the driving rotation of the transport driving roller 11. Dots are formed. Thereby, recording is performed on the recording surface of the recording paper P. The recording sheet P on which recording has been performed on the recording surface is sandwiched between the discharge driving roller 14 and the discharge driven roller 15, is transported in the transport direction YF by the drive rotation of the discharge driving roller 14, and is discharged from the inkjet printer 1. . A series of these recording controls are executed by the control device 100 having a known microcomputer control circuit.

  Furthermore, the ink jet printer 1 includes a head maintenance device 2 that maintains a plurality of recording heads 16 for each head row. The head maintenance device 2 is disposed at a position corresponding to the head row of the recording head 16 and is provided so as to be able to contact and separate from the recording head 16 through a through hole provided in the recording paper support member 13. The control of the head maintenance device 2 is executed by the control device 100.

<Configuration of head maintenance device 2>
The configuration of the head maintenance device 2 will be described with reference to FIGS.
FIG. 3 is a perspective view of the head maintenance device 2, and FIG. 4 is a front view thereof.

  The head maintenance device 2 includes a device base 20 and a plurality of maintenance units 3. The device base 20 includes a pedestal 21, a slide device 22, and a lifting device 23.

  The pedestal 21 is provided with a plurality of maintenance units 3 in an arrangement corresponding to each of the plurality of recording heads 16, and is supported by the slide device 22 so as to be slidable in the direction indicated by the symbol X. The direction indicated by the symbol X is the same as the width direction X (hereinafter referred to as “X direction”). By rotating the slide motor 221 of the slide device 22, the slide shaft 222 slides in the X direction, and thereby the pedestal 21 is displaced in the X direction. That is, the slide device 22 is a device that displaces the maintenance unit 3 in the X direction with respect to the recording head 16. The rotation control of the slide motor 221 is executed by the control device 100.

  The slide device 22 can be moved up and down in the direction indicated by the symbol Z in a state where the support shafts 233 and 234 provided at the top of the lifting device 23 are inserted into the cylindrical bearing portions 223 and 224 provided at the bottom. Is supported by the lifting device 23. The direction indicated by the symbol Z is a direction intersecting with the head surface of the recording head 16 (hereinafter referred to as “Z direction”). The cam engagement portion 225 is integrally provided on the bottom portion of the slide device 22. The lifting cam portion 235 is supported by the lifting device 23 so as to be slidable in the X direction. The convex portion 226 provided on the cam engaging portion 225 is engaged with the cam hole 236 of the elevating cam portion 235. By rotating the lifting motor 231, the slide shaft 232 slides in the X direction, and thereby the lifting cam portion 235 slides in the X direction. Thereby, the slide device 22 is displaced in the Z direction along the shape of the cam hole 236 of the elevating cam portion 235, and the pedestal 21 is raised and lowered in the Z direction. That is, the lifting device 23 is a device that displaces the maintenance unit 3 in the Z direction with respect to the recording head 16. The control of the rotation of the lifting motor 231 is executed by the control device 100.

<Configuration of maintenance unit 3>
The configuration of the maintenance unit 3 will be described with reference to FIG.
FIG. 5 is an overall perspective view of the maintenance unit 3.

  The maintenance unit 3 includes a unit base 30, a cap 40, a head guide 50, a wiper unit 60, an atmosphere release valve unit 70, and a driving force transmission mechanism 80. Hereinafter, these detailed configurations will be described in order.

<Configuration of unit base 30>
The configuration of the unit base 30 will be described with reference to FIG. 6 while continuing to refer to FIG.
FIG. 6 is an exploded perspective view of the unit base 30.

  The unit base 30 is provided on the base 21 of the head maintenance device 2. That is, the unit base 30 is supported by the apparatus base 20 so as to be displaceable in the X direction and the Z direction. The unit base 30 includes a base 31, a left side frame 32, a right side frame 33, a support 34, a support plate 35, a cover member 36, a suction pump 37, a maintenance unit motor 38, and a base member 39 (base). Refer to FIGS. 7 to 10 for the member 39).

  The base 31 is a member that becomes a base of the unit base 30. A concave portion 311 and three female screw holes 315 are formed on the upper surface of the base 31, and a cylindrical portion 312, a gear shaft portion 313, and a through hole 314 are formed in the concave portion 311. The left side frame 32 and the right side frame 33 are members constituting an installation space for the maintenance unit motor 38. The left side frame 32 is screwed and fixed to the left side surface of the base 31 through the through hole 321. The right side frame 33 is fixed to the right side surface of the base 31 with a screw through a through hole 331.

  The strut 34 has a male screw formed on one end side and a female screw formed on the other end side. The three columns 34 are erected on the upper surface of the base 31 with the male screw on one end side screwed into the female screw hole 315 of the base 31. The support plate 35 is a member for fixing the maintenance unit 3 to the pedestal 21 with screws, and is a member that supports an atmosphere release valve unit 70 and a driving force transmission mechanism 80 described later. The support plate 35 is supported on the other end of the three columns 34 and is fixed in a state in which a male screw (not shown) is screwed into the female screw on the other end of the column 34 through the through hole 351. Yes. The cover member 36 is a member that is screwed and fixed to the support plate 35 and that houses a driving force transmission mechanism 80 described later.

  The suction pump 37 is fixed to the upper surface of the base 31 with screws. The pump gear 371 that engages with the drive shaft inside the suction pump 37 is disposed in the recess 311 of the base 31 while being supported by the cylindrical portion 312. The suction pump 37 is for sucking a suction path communicating with a sealing surface of the cap 40 described later, and operates by transmitting the rotation of the maintenance unit motor 38 to the pump gear 371. The known suction pump 37 performs a suction operation to generate a negative pressure when the maintenance unit motor 38 is driven forward, and enters a release state when the maintenance unit motor 38 is driven in the reverse direction. Does not occur. More specifically, the suction pump 37 is a well-known tube pump, and the suction operation is performed by the tube wound around the built-in wheel being handled in one direction, so that the gas or liquid in the tube is pushed out. As a result, a suction force is generated on one end side of the tube (not shown). In addition, a delay mechanism (not shown) is provided at an engagement portion between the drive shaft inside the suction pump 37 and the pump gear 371, and when the rotation direction of the pump gear 371 is switched from reverse rotation to normal rotation, one is not provided. The rotation transmission is delayed by a rotation amount less than the rotation.

  The maintenance unit motor 38 is a known electric motor and is rotationally controlled by the control device 100. The maintenance unit motor 38 is screwed and fixed to the bottom surface of the base 31 with the drive gear 381 provided on the rotating shaft protruding into the recess 311 of the base 31 through the through hole 314 of the base 31. ing. The drive gear 381 meshes with the pump gear 371 in the recess 311 of the base 31. That is, the rotation of the maintenance unit motor 38 is transmitted from the drive gear 381 to the suction pump 37 via the pump gear 371 (pump drive force transmission mechanism).

  A gear 382 is pivotally supported on a gear shaft portion 313 provided in the recess 311 of the base 31. The gear 382 meshes with the drive gear 381 of the maintenance unit motor 38 in the recess 311 of the base 31. The rotation transmission shaft 384 is pivotally supported by the base 31 and the support plate 35. A gear 383 provided integrally with one end of the rotation transmission shaft 384 is disposed in a recess 316 formed on the bottom surface of the base 31. The recess 316 communicates with the recess 311 on the upper surface side, and the gear 383 meshes with the gear 382. A gear 385 integrally provided on the other end side of the rotation transmission shaft 384 meshes with a sun gear 85 constituting a part of a driving force transmission mechanism 80 described later. That is, the rotation of the maintenance unit motor 38 is transmitted from the drive gear 381 to the drive force transmission mechanism 80 via the gear 382, the gear 383, the rotation transmission shaft 384, and the gear 385.

<Configuration of Cap 40 and Head Guide 50>
The configuration of the cap 40 and the head guide 50 will be described with reference to FIGS.
FIG. 7 is a perspective view illustrating a portion where the cap 40, the head guide 50, and the base member 39 are extracted, FIG. 8 is an exploded perspective view of the portion, and FIG. 9 is a side view of the portion. FIG.

  The cap 40 as a “sealing member” is disposed inside the head guide 50, and includes two sealing portions 41 and a cap body 42. The sealing portion 41 is supported by the support portion 422 in a state where the support hole 413 is engaged with the tip convex portion of the support portion 422 formed in the negative pressure chamber 421 of the cap body 42. The sealing surface 411 of the sealing part 41 forms a closed space sealed between the head surface of the recording head 16 when the sealing surface 411 is in close contact with the head surface of the recording head 16. The communication hole 412 is a through hole that allows the sealing surface 411 to communicate with the negative pressure chamber 421 of the cap body 42. The negative pressure chamber 421 of the cap body 42 communicates with a suction hole portion 428 and an air communication hole portion 429 that protrude from the bottom of the cap body 42. The suction hole 428 is connected to the suction pump 37 via a flexible suction tube (not shown). The atmosphere communication hole 429 is connected to an atmosphere release valve unit 70 described later through a flexible atmosphere release tube (not shown).

  A base member 39 constituting a part of the unit base 30 is fixed to the upper surface of the cover member 36 with screws. The base member 39 has two cylindrical spring support portions 391. The two coil springs 392 are respectively inserted into the spring support portion 391 and supported by the base member 39 in a state where one end side is in contact with the bottom portion in the spring support portion 391. The other end sides of the two coil springs 392 are in contact with the bottom of the cap body 42. That is, the cap 40 is elastically supported on the unit base 30 by the two coil springs 392.

  The head guide 50 as the “movable member” and the “guide member” engages with the recording head 16 when the sealing surface 411 of the cap 40 is brought into contact with the head surface of the recording head 16 to be in close contact with the recording head 16. This is a member for regulating the relative positional relationship between the recording head 16 and the cap 40 in the direction along the head surface. More specifically, when the sealing surface 411 of the cap 40 is brought into contact with and closely contacted with the head surface of the recording head 16, eight guide portions 51 formed so as to surround the cap 40 are provided on the recording head 16 side. Engage with the part. That is, the eight guide portions 51 are located at both ends of the recording head 16 in the Y direction (first direction) that is a direction along the head surface of the recording head 16 and intersects the X direction, and in the X direction (second direction). Engage with both ends of the recording head 16. Further, when the inner side surface 52 of the head guide 50 is engaged with the outer peripheral surface of the cap 40, the head guide 50 and the cap 40 in the direction along the head surface of the recording head 16 are caused by the inner side surface 52 of the head guide 50. The relative positional relationship of is regulated. Accordingly, positioning when the sealing surface 411 of the cap 40 is brought into close contact with the head surface of the recording head 16 can be performed with high accuracy.

  The head guide 50 is disposed in a space between the cap 40 and the base member 39, and is supported by the base member 39 so as to be displaceable in the Z direction. That is, the maintenance unit 3 is configured such that the head guide 50 provided separately from the cap 40 can be independently displaced in the Z direction. Thus, only the head guide 50 can be displaced in the Z direction while maintaining the distance between the head surface of the recording head 16 and the sealing surface 411 of the cap 40.

  A semicircular recess 393 formed in the base member 39 constitutes a housing space for the left cam structure 81. Similarly, the semicircular recess 394 formed in the base member 39 constitutes a housing space for the right cam structure 82. Further, the recess 393 of the base member 39 and the semicircular cutout formed in the recess 394 are integrated with a support groove 363 (see FIG. 33) formed in the cover member 36 to support the camshaft 83. Parts. The cam shaft 83 is fixed to the support portion. The left cam structure 81 is pivotally supported on one end side of the cam shaft 83, and the right cam structure 82 is pivotally supported on the other end side of the cam shaft 83. That is, the left cam structure 81 and the right cam structure 82 are supported by the unit base 30 so as to be independently rotatable.

  The left cam structure 81 and the right cam structure 82 are cam structures including a cam for displacing the head guide 50. The left cam structure 81 and the right cam structure 82 are not symmetrical parts, but are parts having the same shape. Therefore, the left cam structure 81 and the right cam structure 82 always have the same amount of rotation in opposite directions when the driving force of the maintenance unit motor 38 is transmitted via a driving force transmission mechanism 80 described later and rotates. The driving force is transmitted so as to rotate. The convex portion 541 formed on the right arm portion 54 of the head guide 50 is engaged with the head guide cam (guide member cam) 822 of the right cam structure 82. Similarly, a convex portion 531 (see FIG. 11) formed on the left arm portion 53 of the head guide 50 is engaged with a head guide cam (not shown) of the left cam structure 81.

  Since the left cam structure 81 and the right cam structure 82 are parts having the same shape as described above, when the left cam structure 81 and the right cam structure 82 are described below, the right cam structure 82 is taken as an example. The description of the left cam structure 81 will be omitted as appropriate.

  When the right cam structure 82 rotates in the rotation direction A1 and the left cam structure 81 rotates in the direction opposite to the rotation direction A1, the head guide 50 moves upward along the shape of the head guide cam 822. The state is shifted to ZU (one direction in the Z direction and the direction approaching the recording head 16). In this state, the guide portion 51 of the head guide 50 protrudes from the sealing surface 411 of the cap 40 toward the recording head 16 (FIG. 9A).

  Accordingly, when the maintenance unit 3 is displaced in this direction in the direction approaching the recording head 16 by the lifting device 23, the guide portion 51 of the head guide 50 is first engaged with the recording head 16, and subsequently the sealing surface of the cap 40 411 contacts the head surface of the recording head 16. That is, the cap 40 is sealed on the head surface of the recording head 16 in a state where the relative positional relationship between the recording head 16 and the cap 40 in the direction along the head surface of the recording head 16 is regulated by the guide portion 51 of the head guide 50. The stop surface 411 can be adhered.

  On the other hand, in the head guide 50, when the right cam structure 82 rotates in the rotation direction A2 and the left cam structure 81 rotates in the direction opposite to the rotation direction A2, the head guide 50 follows the shape of the head guide cam 822. It is displaced in the descending direction ZD (the other direction in the Z direction and the direction away from the recording head 16). In this state, the guide portion 51 of the head guide 50 is retracted in a direction away from the recording head 16 from the sealing surface 411 of the cap 40. That is, the sealing surface 411 of the cap 40 protrudes from the protruding end of the guide portion 51 of the head guide 50 to the head surface side of the recording head 16 (FIG. 9B).

  In such a state, it is possible to prevent the guide portion 51 of the head guide 50 from hindering the conveyance of the recording paper P or the like at the time of flushing performed between recording executions on the recording paper P. Therefore, it is not necessary to reciprocate the maintenance unit 3 in the Z direction every time flushing is performed, and the time required for flushing does not become unnecessarily long. Further, it is possible to perform flushing while maintaining the interval between the head surface of the recording head 16 and the sealing surface 411 of the cap 40 at an interval suitable for flushing. More specifically, flushing can be performed with the distance between the head surface of the recording head 16 and the sealing surface 411 of the cap 40 as short as possible. Accordingly, since the amount of mist generated during flushing can be minimized, the amount of mist generated during flushing can be reduced without reducing the throughput of the inkjet printer 1.

FIG. 10 is a perspective view illustrating an engaged state between the cap 40 and the base member 39.
In FIG. 10, the base member 39 is illustrated in a fragmentary manner in order to better illustrate the engagement state between the cap 40 and the base member 39.

  The cap body 42 of the cap 40 includes a first locking portion 423 and a second locking portion 424 as “first restricting portions”. The first locking portion 423 is a portion that connects the tips of the two arm portions 42a formed so as to protrude in the Z direction from the bottom portion of the cap body 42 in the X direction. Similarly, the second locking portion 424 is a portion that connects the tips of the two arm portions 42 b formed so as to protrude in the Z direction from the bottom portion of the cap body 42 in the X direction.

  The base member 39 includes a first locking claw portion 395, a second locking claw portion 396, a third locking claw portion 397, and a fourth locking claw portion 398. The first locking claw portion 395 and the second locking claw portion 396 are formed at positions corresponding to the Z direction with respect to the first locking portion 423 of the cap body 42. The third locking claw portion 397 and the fourth locking claw portion 398 are formed at positions corresponding to the second locking portion 424 of the cap body 42 in the Z direction.

  At least in a state where the head guide 50 is in a predetermined position where the guide portion 51 protrudes from the sealing surface 411 of the cap 40 toward the recording head 16 (hereinafter referred to as “first displacement position”), The first locking portion 423 of the cap body 42 comes into contact with the first locking claw portion 395 and the second locking claw portion 396 of the base member 39 (FIG. 10A) due to the elastic force, and the cap body 42 The two locking portions 424 come into contact with the third locking claw portion 397 and the fourth locking claw portion 398 of the base member 39 (FIG. 10B). Accordingly, the posture of the cap 40 is regulated so that the sealing surface 411 is parallel to the head surface of the recording head 16.

  FIG. 11 is a perspective view and a front view illustrating an engaged state between the cap 40 and the head guide 50.

  The cap body 42 of the cap 40 includes a first contact portion 425, a second contact portion 426, and a third contact portion 427 as “second restricting portions”. The first contact portion 425 is formed integrally with the first locking portion 423 so as to protrude in the Z direction. The second contact portion 426 and the third contact portion 427 are integrally formed with the second locking portion 424 so as to protrude in the Z direction. The first contact portion 425 and the second contact portion 426 are formed with an interval in the Y direction (first direction). The third contact portion 427 is formed with an interval in the X direction (second direction) with respect to the first contact portion 425 and the second contact portion 426.

  The head guide 50 has a first contacted portion 55, a second contacted portion 56, and a third contacted portion 57. The first abutted portion 55 is formed at a position corresponding to the first abutting portion 425 of the cap body 42 in the Z direction. The second abutted portion 56 is formed at a position corresponding to the second abutting portion 426 of the cap body 42 in the Z direction. The third abutted portion 57 is formed at a position corresponding to the third abutting portion 427 of the cap body 42 in the Z direction. Further, in the state where the position of the cap 40 is regulated so that the sealing surface 411 is parallel to the head surface of the recording head 16 (the state illustrated in FIG. 10), The distance between the first abutted portion 55 and the second abutted portion 426 and the second abutted portion 56 in the Z direction, the third abutting portion 427 and the third abutted portion. The distance in the Z direction from 57 is different from each other. More specifically, for example, the first abutted portion 55, the second abutted portion 56, and the third abutted portion 57 of the head guide 50 are set to a certain height in the Z direction, and the first main The contact part 425, the second contact part 426, and the third contact part 427 may be formed with a step in the Z direction. Alternatively, the first abutting portion 425, the second abutting portion 426, and the third abutting portion 427 of the cap body 42 are set to have a constant height in the Z direction, and the first abutted portion 55 and the second abutted portion of the head guide 50 are set. The contact portion 56 and the third contacted portion 57 may be formed with a step in the Z direction.

  When the head guide 50 is displaced to a predetermined position separated from the recording head 16 from the first displacement position (hereinafter referred to as “second displacement position”), the first contact of the cap body 42 with the elastic force of the coil spring 392 is performed. The portion 425, the second contact portion 426, and the third contact portion 427 are in contact with the first contact portion 55, the second contact portion 56, and the third contact portion 57 of the head guide 50, respectively. (FIG. 11). In this state, the first locking portion 423 and the second locking portion 424 of the cap body 42 are the first locking claw portion 395, the second locking claw portion 396, and the third locking claw portion of the base member 39. 397 and the fourth locking claw portion 398 are separated. Thereby, the posture of the cap 40 is regulated so that the sealing surface 411 is three-dimensionally inclined with respect to the head surface of the recording head 16 (inclined in the X direction and the Y direction).

  FIG. 12 is an operation explanatory diagram illustrating the head surface sealing operation and the sealing release operation of the recording head 16 in a simplified manner. Hereinafter, an example of the head surface sealing operation and the sealing release operation of the recording head 16 in the head maintenance device 2 according to the present invention will be described with reference to FIG.

  In a state where the head guide 50 is in the first displacement position, the first locking portion 423 and the second locking portion 424 of the cap 40 are moved by the elastic force of the coil spring 392, the first locking claw portion 395 of the base member 39, The second locking claw portion 396, the third locking claw portion 397 and the fourth locking claw portion 398 are in contact with each other (FIG. 12A). Accordingly, the posture of the cap 40 is regulated so that the sealing surface 411 is parallel to the head surface of the recording head 16 (FIG. 10). That is, the parallel posture of the cap 40 is held on the maintenance unit 3 side. Therefore, positioning when the sealing surface 411 of the cap 40 is brought into close contact with the head surface of the recording head 16 can be performed with high accuracy.

  From this state, when the maintenance unit 3 is displaced in the ascending direction ZU by the lifting device 23, the guide portion 51 of the head guide 50 is first engaged with the recording head 16, and then the sealing surface 411 of the cap 40 is the recording head 16. (Fig. 12 (b)). And the raising / lowering apparatus 23 is stopped in the position which displaced the maintenance unit 3 to the raising direction ZU further. Accordingly, the sealing surface 411 of the cap 40 is pressed against and closely contacts the head surface of the recording head 16 by the elastic force (elastic restoring force) of the coil spring 392 in a compressed state. Further, after the sealing surface 411 contacts the head surface of the recording head 16, the displacement of the cap 40 in the upward direction ZU is locked by the recording head 16. Therefore, the first locking portion 423 and the second locking portion 424 of the cap 40 are the first locking claw portion 395, the second locking claw portion 396, the third locking claw portion 397 and the fourth locking portion of the base member 39. It will be in the state spaced apart from the latching claw part 398 (FIG.12 (c)).

  From this state, after the head guide 50 at the first displacement position is displaced in the downward direction ZD and moved to the second displacement position (FIG. 12D), the maintenance unit 3 is moved in the downward direction ZD by the lifting device 23. Displace it. As a result, the first contact portion 425 of the cap 40 first comes into contact with the first contacted portion 55 of the head guide 50 (FIG. 12E), and then the second contact portion 426 of the cap 40 becomes the head guide. 50, the third contact portion 427 of the cap 40 finally contacts the third contact portion 57 of the head guide 50 (FIG. 12 (f)). In this state, the posture of the cap 40 is regulated so that the sealing surface 411 is tilted three-dimensionally with respect to the head surface of the recording head 16 (FIG. 11). As a result, the cap 40 can be separated from the head surface of the recording head 16 while the sealing surface 411 is inclined. Therefore, the sealing surface 411 of the cap 40 is separated from the head surface of the recording head 16. Ink scattering can be reduced.

  Then, when the maintenance unit 3 is displaced in the descending direction ZD to the original position, the lifting device 23 is stopped (FIG. 12G), and the head guide 50 at the second displacement position is displaced in the ascending direction ZU. Move to one displacement position (FIG. 12 (h)). Accordingly, the head maintenance device 2 can be returned to the initial state (the state illustrated in FIG. 12A).

  In this way, the head maintenance device 2 according to the present invention can perform positioning when the sealing surface 411 of the cap 40 is brought into close contact with the head surface of the recording head 16 and also the head surface of the recording head 16. The scattering of ink that occurs when the sealing surface 411 of the cap 40 is separated from the ink can be reduced.

<Configuration of wiper unit 60>
The configuration of the wiper unit 60 will be described with reference to FIGS.
FIG. 13 is a perspective view illustrating a portion where the head guide 50 and the wiper unit 60 are provided. FIG. 14 is a perspective view of the wiper unit 60, and FIG. 15 is an exploded perspective view thereof.

  The wiper unit 60 includes a wiper support member 61, a first wiper attachment member 62, a first wiper 63, a second wiper attachment member 64, and a second wiper 65.

  The wiper support member 61 is disposed further outside the base member 39 provided outside the head guide 50, and is supported by the base member 39 so as to be displaceable in the Z direction.

  The first wiper 63 is formed of an elastic material such as an elastomer, and is a member for removing deposits attached to the head surface of the recording head 16 by wiping in the X direction. More specifically, the maintenance unit 3 is displaced in the X direction with respect to the recording head 16 in a state in which the wiper support member 61 is moved to a position where the first wiper 63 can slide on the head surface of the recording head 16. Then, the tip 631 of the first wiper 63 is brought into sliding contact with the head surface of the recording head 16. Thereby, the adhering matter adhering to the head surface of the recording head 16 is wiped away by the first wiper 63 and removed.

  The first wiper attachment member 62 is a member for easily attaching the first wiper 63 to the wiper support member 61. The first wiper 63 is fixed in a state in which the mounting groove 624 of the first wiper mounting member 62 is inserted and the hole 632 is engaged with a convex portion (not shown) in the mounting groove 624. 62 is attached.

  The first wiper attachment member 62 can be easily attached to the wiper support member 61 by the following attachment procedure. First, the circular convex portions 621 and 622 are engaged with the bent elongated holes 611 and 612 formed in the side wall portion of the wiper support member 61, and pushed downward along the shape of the bent elongated holes 611 and 612. Accordingly, the two locking portions 625 are locked to the upper end of the side wall portion of the wiper support member 61. Further, it is slid in the Y direction from the state along the bent elongated holes 611 and 612 to the end thereof. Accordingly, the convex portion 623 is hooked on the hooking claw portion 613 of the wiper support member 61, and the first wiper mounting member 62 is positioned and mounted at a predetermined position of the wiper support member 61. The first wiper mounting member 62 attached to the wiper support member 61 is bent in a state in which the latching claw portion 613 of the wiper support member 61 is bent outward and the latching of the convex portion 623 is released. After sliding in the Y direction along the shape of the long holes 611 and 612, it can be easily removed by pulling upward.

  The second wiper 65 is a member for removing the adhering matter adhering to the head surface of the recording head 16 by wiping in the Y direction. Like the first wiper 63, the second wiper 65 is formed of an elastic material such as an elastomer. ing. Further, the second wiper 65 has a tip portion 651 that is tapered as shown in the figure, and a tip portion 651 that is bent inward. The second wiper attachment member 64 is a member for attaching the second wiper 65 to the wiper support member 61 easily. The second wiper 65 is fixed in a state in which the mounting groove 644 of the second wiper mounting member 64 is inserted and the hole 652 is engaged with a convex portion (not shown) in the mounting groove 644. 64 is attached.

  Similar to the first wiper mounting member 62, the second wiper mounting member 64 can be easily attached to and detached from the wiper support member 61. First, the circular convex portions 641 and 642 are engaged with the bent elongated holes 614 and 615 formed in the side wall portion of the wiper support member 61, and pushed downward along the shape of the bent elongated holes 614 and 615. Accordingly, the two locking portions 645 are locked to the upper end of the side wall portion of the wiper support member 61. Further, it is slid in the X direction from the state along the bent elongated holes 614 and 615 to the end thereof. Accordingly, the convex portion 643 is hooked on the hooking claw portion 616 of the wiper support member 61, and the second wiper mounting member 64 is positioned and attached to a predetermined position of the wiper support member 61. Further, the second wiper mounting member 64 attached to the wiper support member 61 is bent in a state where the latching claw portion 616 of the wiper support member 61 is bent outward and the latching of the convex portion 643 is released. After sliding in the X direction along the shape of the long holes 614, 615, it can be easily removed by pulling upward.

  By adopting such a wiper attachment structure with a snap-fit mechanism, the first wiper 63 and the second wiper 65 having a reduced ability to wipe off the deposit can be easily replaced. It becomes easy to maintain the wiping ability of the wiper 65. Only one of the first wiper 63 and the second wiper 65 may be attached to the wiper support member 61 according to the specifications of the target ink jet printer 1 or both. You may use it attached to.

Further, as a modification, the first wiper 63 and the second wiper 65 may be arranged in parallel with the wiper support member 61 in the same direction. Accordingly, the operation of wiping off the deposit on the head surface of the recording head 16 with the wiper can be performed twice by one wiping, so that the ability to remove the deposit on the head surface of the recording head 16 is improved. Can do. Alternatively, two or more wipers having different shapes and elasticity can be selectively used depending on the state of the head surface of the recording head 16 and the like.
In the present embodiment, the case where only the first wiper 63 is attached will be described below as an example.

<Wiper cleaner 58>
The wiper cleaner 58 will be described with reference to FIGS. 16 and 17.

FIG. 16 is a perspective view of the head guide 50.
The head guide 50 is provided with a wiper cleaner 58 as a “removal part” that removes deposits attached to the first wiper 63 by sliding contact with the first wiper 63 (not shown in FIGS. 3 to 12). ). The wiper cleaner 58 is formed by sticking an absorbent material such as felt on the surface of a thin metal member. The wiper cleaner 58 has a shape in which elasticity is imparted to the sliding contact engaging portion 581 by the elastic support portion 582, and the sliding contact engaging portion 581 is in sliding contact with the first wiper 63. The deposits attached to the first wiper 63 can be removed by sliding the sliding contact engaging portion 581 of the wiper cleaner 58 against the first wiper 63. At this time, since the wiper cleaner 58 is supported in a state of being given elasticity by the elastic support portion 582, it is possible to reduce a possibility that an excessive frictional force is generated in the sliding contact portion. Accordingly, it is possible to reduce the possibility that the first wiper 63 is worn or damaged when the wiper cleaner 58 is in sliding contact with the first wiper 63.

FIG. 17 is a perspective view illustrating a modification of the wiper cleaner 58.
The wiper cleaner 58 of the modified example is integrally formed with the guide portion 51 of the head guide 50 made of a synthetic resin member such as plastic. Since the synthetic resin member such as plastic is a material having elasticity, the wiper cleaner 58 can be brought into sliding contact with the first wiper 63 with elasticity. It is also possible to provide the wiper cleaner 58 in such a manner, whereby the number of parts can be reduced and a lower cost configuration can be achieved.

<Displacement mechanism of wiper unit 60>
The displacement mechanism of the wiper unit 60 will be described with reference to FIG. 18 and also with reference to FIGS.
FIG. 18 is a perspective view illustrating an engagement portion between the left cam structure 81 and the right cam structure 82 and the wiper unit 60.

  The wiper unit 60 includes a left cam engagement member 66, a right cam engagement member 67, a left cam biasing spring 68, and a right cam biasing spring 69.

  The right cam engagement member 67 is fixed to the wiper support member 61 with a screw through a through hole 673. The shaft portion 671 of the right cam engaging member 67 projects inward of the wiper support member 61 through the hole 618 of the wiper support member 61, and further, the head guide 50 through the long hole 543 of the right arm portion 54 of the head guide 50. Protrudes inward. The engaging portion 672 formed at the tip of the shaft portion 671 is engaged with the wiper support member cam 823 of the right cam structure 82. The right cam biasing spring 69 (see FIGS. 20 to 23) biases the engaging portion 672 of the right cam engaging member 67 to the wiper support member cam 823 of the right cam structure 82, and the head guide 50. Is engaged with a spring locking portion 542 formed on the right arm portion 54, and the convex portion 541 formed on the right arm portion 54 is biased toward the head guide cam 822 of the right cam structure 82.

  Similarly, the left cam engagement member 66 is fixed to the wiper support member 61 with a screw through a through hole 663. The shaft portion 661 of the left cam engagement member 66 protrudes to the inside of the wiper support member 61 via the hole portion 617 of the wiper support member 61, and further the head guide 50 via the long hole 533 of the left arm portion 53 of the head guide 50. Protrudes inward. The engaging portion 662 formed at the tip of the shaft portion 661 is engaged with a wiper support member cam (not shown) of the left cam structure 81. The left cam urging spring 68 urges the engaging portion 662 of the left cam engaging member 66 to a wiper support member cam (not shown) of the left cam structure 81 and is applied to the left arm portion 53 of the head guide 50. The formed convex portion 531 is urged to a head guide cam (not shown) of the left cam structure 81.

<Cleaning operation of first wiper 63>
An operation (hereinafter referred to as “cleaning operation of the first wiper 63”) for wiping off deposits adhering to the first wiper 63 with the wiper cleaner 58 will be described with reference to FIGS.
FIG. 19 is an enlarged side view of a main part in which a portion where the right cam structure 82 is provided is enlarged. FIGS. 20 to 23 are enlarged perspective views of the main part showing the sliding contact engagement portion between the first wiper 63 and the wiper cleaner 58.

  The gear portion 811 of the left cam structure 81 and the gear portion 821 of the right cam structure 82 are meshed with a cam drive gear portion 841 of a rotating body 84 constituting a drive force transmission mechanism 80 described later. A protrusion 824 is formed at a predetermined position on the outer peripheral surface of the right cam structure 82. This protrusion 824 engages with a recess 847 formed on the outer side of the cam drive gear portion 841 of the rotating body 84 and plays a role of defining the phase of the right cam structure 82 with respect to the rotational position of the rotating body 84. For example, when the maintenance unit 3 is assembled, the maintenance unit 3 is assembled in a state where the protrusion 824 of the right cam structure 82 is engaged with the recess 847 of the rotating body 84. Accordingly, it is easy to mesh the gear portion 821 of the right cam structure 82 with the cam drive gear portion 841 of the rotating body 84 in a state where there is no deviation in the phase of the right cam structure 82 with respect to the rotational position of the rotating body 84. It can be done reliably.

  As described above, since the left cam structure 81 and the right cam structure 82 are parts having the same shape, the right cam structure 82 will be described below as an example, and the description of the left cam structure 81 will be omitted. .

  The convex portion 541 formed on the right arm portion 54 of the head guide 50 engages with the head guide cam 822 of the right cam structure 82 in the range indicated by the symbol B (hereinafter, the “head guide 50 is simply referred to as the head guide 50). It is referred to as “engaged with the cam 822”). That is, the head guide 50 is displaced in the Z direction along the shape of the head guide cam 822 of the right cam structure 82 in the range indicated by the symbol B. Further, the shaft portion 671 formed on the right cam engagement member 67 of the wiper support member 61 engages with the wiper support member cam 823 of the right cam structure 82 in the range indicated by the symbol C (hereinafter simply referred to as “ The wiper support member 61 is engaged with the wiper support member cam 823 ”. That is, the wiper unit 60 is displaced in the Z direction along the shape of the wiper support member cam 823 of the right cam structure 82 in the range indicated by the symbol C.

  In the rotation range (first cam portion) indicated by reference sign D1 of the right cam structure 82, the head guide 50 and the wiper unit 60 are both displaced to the uppermost position in the Z direction (FIG. 20). ). In this state, the guide portion 51 of the head guide 50 protrudes from the sealing surface 411 of the cap 40 toward the recording head 16 (FIG. 9A). That is, the cap 40 is sealed on the head surface of the recording head 16 in a state where the relative positional relationship between the recording head 16 and the cap 40 in the direction along the head surface of the recording head 16 is regulated by the guide portion 51 of the head guide 50. The stop surface 411 can be brought into close contact.

  In this state, since the tip 631 of the first wiper 63 is covered with the wiper cleaner 58, the possibility that foreign matters such as paper dust and dust adhere to the tip 631 of the first wiper 63 may be reduced. it can. As a result, it is possible to reduce the possibility that the foreign matter adhering to the first wiper 63 is transferred to and attached to the head surface of the recording head 16 during wiping. Further, in a state where the tip 631 of the first wiper 63 is covered with the wiper cleaner 58, the state in which the surface of the sliding contact engaging portion 581 of the wiper cleaner 58 that is in sliding contact with the first wiper 63 is in contact with the first wiper 63 is maintained. Is done. Accordingly, it is possible to reduce the possibility that foreign matters such as paper dust and dust adhere to the surface where the first wiper 63 of the sliding contact engaging portion 581 of the wiper cleaner 58 comes into sliding contact. Therefore, when the slidable contact engaging portion 581 of the wiper cleaner 58 is slidably contacted with the first wiper 63, there is a possibility that foreign matter attached to the slidable engaging portion 581 may be transferred to the first wiper 63 and attached. Can be reduced.

  In the rotation range (second cam portion) indicated by reference sign D2 of the right cam structure 82, the wiper unit 60 is maintained in the displaced state in the uppermost position in the Z direction. On the other hand, the head guide 50 is displaced in the downward direction ZD when the right cam structure 82 rotates in the reverse rotation direction RD, and is displaced in the upward direction ZU when the right cam structure 82 rotates in the normal rotation direction FD. That is, in the rotation range indicated by reference sign D2, the wiper unit 60 can move only the head guide 50 up and down (displacement in the Z direction) while maintaining the state displaced to the uppermost position in the Z direction (FIG. 21). . In the process of moving only the head guide 50 up and down, the wiper cleaner 58 provided on the head guide 50 is brought into sliding contact with the side surface from the tip 631 of the first wiper 63 to perform the cleaning operation of the first wiper 63. As a result, the deposit adhered to the first wiper 63 is removed by the wiper cleaner 58.

  In the rotation range indicated by reference sign D3 of the right cam structure 82, the wiper unit 60 remains displaced in the uppermost position in the Z direction, and the head guide 50 remains displaced in the lowermost position in the Z direction. (FIG. 22). In this state, the first wiper 63 protrudes from the guide portion 51 of the head guide 50 toward the recording head 16 (FIG. 22). Therefore, in this state, the head surface of the recording head 16 can be wiped with the first wiper 63.

  In the rotation range (third cam portion) indicated by reference sign D4 of the right cam structure 82, the head guide 50 is maintained in the state of being displaced to the lowest end position in the Z direction. On the other hand, the wiper unit 60 is displaced in the downward direction ZD when the right cam structure 82 rotates in the reverse rotation direction RD, and is displaced in the upward direction ZU when the right cam structure 82 rotates in the normal rotation direction FD. That is, in the rotation range indicated by reference numeral D4, the head guide 50 can move only the wiper unit 60 up and down (displacement in the Z direction) while maintaining the state displaced to the lowermost position in the Z direction. Further, in the process of moving only the wiper unit 60 up and down, the wiper cleaner 58 provided on the head guide 50 is brought into sliding contact with the side surface from the tip 631 of the first wiper 63 to perform the cleaning operation of the first wiper 63. As a result, the deposit adhered to the first wiper 63 is removed by the wiper cleaner 58.

  In the rotation range indicated by reference sign D5 of the right cam structure 82, the head guide 50 and the wiper unit 60 are both maintained in the state of being displaced to the lowest end position in the Z direction (FIG. 23). In this state, the sealing surface 411 of the cap 40 protrudes from the protruding end of the guide portion 51 of the head guide 50 and the tip 631 of the first wiper 63 to the head surface side of the recording head 16 (FIG. 9B). ). That is, as described above, the flushing can be performed while maintaining the gap between the head surface of the recording head 16 and the sealing surface 411 of the cap 40 at a gap suitable for flushing.

  Thus, the state in which the sealing operation of the head surface of the recording head 16 can be regulated with high accuracy by the head guide 50 (FIG. 9A) to the state in which wiping can be performed (FIG. 22), with an optimal ink ejection distance. In the process of sequentially shifting the state of the maintenance unit 3 to a state where flushing is possible (FIG. 9B), the cleaning operation of the first wiper 63 is performed at least twice. Also in the process of sequentially shifting the state of the maintenance unit 3 in the reverse order, the cleaning operation of the first wiper 63 is performed at least twice. That is, the cleaning operation of the first wiper 63 by the wiper cleaner 58 in a series of maintenance operations in which the head guide 50 and the wiper unit 60 are advanced and retracted individually with respect to the recording head 16, without causing unnecessary operations. It can be performed at least four times. Accordingly, it is possible to reliably reduce the possibility that all the deposits attached to the first wiper 63 cannot be removed without reducing the throughput of the inkjet printer 1.

<Configuration of Atmospheric Release Valve Unit 70>
The configuration of the atmosphere release valve unit 70 will be described with reference to FIGS.
FIG. 24 is a perspective view of the atmosphere release valve unit 70 as viewed obliquely from the front. FIG. 25 is a perspective view of the atmosphere release valve unit 70 as viewed obliquely from the rear. FIG. 26 is an exploded perspective view of the atmosphere release valve unit 70. FIG. 27 is a side view of the atmosphere release valve unit 70 partially shown in cross section.

  The atmosphere release valve unit 70 is provided to open and close an atmosphere communication path that opens the sealing surface 411 of the cap 40 to the atmosphere. The air release valve unit 70 includes a unit casing 71, a swing member 72, a support member 73, a valve body support portion 74, a valve seat portion 75, and a push latch mechanism portion 90.

  The unit housing 71 is integrally formed with a mechanism main body 91 constituting a part of the push latch mechanism 90, and a valve seat 75 is fixed with screws. The support member 73 is fixed to the valve seat portion 75 with screws. The swing member 72 is supported by the support member 73 so as to be swingable in the direction indicated by the symbol F in a state where the notch portion 721 is engaged with the swing support convex portion 731 of the support member 73. The swinging member 72 is a swinging member in which the contacted portion 722 comes into contact with the contact portion 958 of the operation shaft body 95 constituting a part of the push latch mechanism portion 90 by an urging means such as a torsion coil spring (not shown). It is biased in the moving direction. That is, the swing member 72 swings in the swing direction F when the operation shaft body 95 of the push latch mechanism 90 is displaced in the operation direction E.

  The valve body support portion 74 is displaceable to the support member 73 so as to be displaceable in a direction indicated by a symbol G (hereinafter referred to as “opening / closing direction G”) in a state where the shaft portion 742 is inserted into the insertion hole 732 of the support member 73. It is supported. The engaging portion 723 of the swing member 72 is engaged with the engaged portion 741 formed at the tip of the shaft portion 742. That is, the valve body support portion 74 is provided so as to reciprocate in the opening / closing direction G when the swing member 72 swings in the swing direction F. The valve body 743 supported by the valve body support portion 74 is a disk-shaped member having a step, and is formed of a flexible material such as rubber. The valve body 743 contacts and separates from the inner peripheral surface of the valve seat portion 75 as the shaft portion 742 reciprocates in the opening and closing direction G while maintaining a state in which the valve body 743 is in close contact with the periphery of the concave valve seat 753 without a gap. Elastically deforms in the direction.

  A first tube portion 751 and a second tube portion 752 are provided on the back side of the valve seat portion 75. The first pipe portion 751 is connected to the atmosphere communication hole portion 429 of the cap body 42 of the cap 40 via a flexible atmosphere release tube (not shown). The 2nd pipe part 752 is open | released to air | atmosphere through the air release tube which is not shown in figure. The valve seat 753 of the valve seat 75 has a first through hole 754 that allows the first pipe portion 751 to communicate with the inner peripheral surface of the valve seat 753, and a second pipe portion 752 that communicates with the inner peripheral surface of the valve seat 753. A second through hole 755 is formed.

  In the atmosphere release valve unit 70 having such a configuration, the swing member 72 swings in the swing direction F when the operation shaft body 95 of the push latch mechanism 90 is displaced in the operation direction E. As a result, the valve body support portion 74 reciprocates in the opening and closing direction G, and the valve body 743 is elastically deformed in a direction in which the valve body 743 comes into contact with and separates from the inner peripheral surface of the valve seat portion 75. In a state where the central portion of the valve body 743 is separated from the inner peripheral surface of the valve seat 753, the first pipe portion 751 is connected to the first pipe portion 751 through a closed space formed between the inner peripheral surface of the valve seat 753 and the valve body 743. It will be in the state which the 2nd pipe part 752 communicates. In this state, the atmosphere release valve unit 70 is open, that is, the sealing surface 411 of the cap 40 is open to the atmosphere via the atmosphere release tube. On the other hand, in a state where the central portion of the valve body 743 is seated in surface contact with the inner peripheral surface of the valve seat 753, the first through hole 754 and the second through hole 755 are blocked by the valve body 743. Become. Therefore, the communication between the first pipe portion 751 and the second pipe portion 752 is blocked by the valve body 743. In this state, the atmosphere release valve unit 70 is closed, that is, the sealing surface 411 of the cap 40 is closed. It will be in the state which is not open | released to air | atmosphere via an air release tube.

<Configuration of Push Latch Mechanism 90>
The configuration of the push latch mechanism 90 will be described with reference to FIGS. 28 and 29 with reference to FIGS.
FIG. 28 is a bottom view of the push latch mechanism 90, a part of which is shown in cross section. FIG. 29 is an exploded perspective view of the push latch mechanism 90 as seen from the bottom side with a partial cross-sectional view.

  The push latch mechanism 90 for opening and closing the valve body 743 of the air release valve unit 70 has a structure based on a cam mechanism generally used for a so-called knock-type writing instrument in the embodiment. is there. The push latch mechanism 90 includes a mechanism main body 91, a push member 92, a reset member 93, a cylindrical body 94, and an operation shaft body 95.

  The mechanism main body 91 is integrally formed with the unit housing 71 as described above. The mechanism main body 91 has a first cylindrical portion 911, a second cylindrical portion 912, and a third cylindrical portion 913 that form a continuous space in which the inner diameter gradually increases. A rectangular guide hole 914 is formed at the entrance of the first cylindrical portion 911. A guide portion 915 that is notched along the operation direction E is formed on the upper portion of the first cylindrical portion 911.

  The push member 92 is supported by the first cylindrical portion 911 so as to be displaceable in the operation direction E while being guided by the guide hole 914 and locked in the circumferential direction. A cam portion 922 and a locking portion 923 are provided. The push operation part 921 is disposed in a state where the tip protrudes from the guide hole 914 of the first cylindrical part 911. The locking portion 923 has a disk shape that is slightly smaller than the inner diameter of the first cylindrical portion 911 and larger than the guide hole 914. The push operation portion 921 is supported so as to be displaceable in the operation direction E when the outer peripheral surface of the locking portion 923 is in sliding contact with the inner peripheral surface of the first cylindrical portion 911. Further, the locking portion 923 of the push operation portion 921 prevents the first operation portion 921 from dropping off from the first cylindrical portion 911 when the push operation portion 921 is displaced in the operation direction E. In the wave-tooth cam portion 922, eight wave teeth formed by alternately forming an ascending slope and a descending slope in the circumferential direction are formed at equal intervals in the circumferential direction.

  The reset member 93 is disposed so as to be displaceable in the operation direction E in a state where the cylindrical portion 933 is inserted into the second cylindrical portion 912 and the reset operation portion 931 is engaged with the guide portion 915 of the first cylindrical portion 911. ing. The reset member 93 is urged in a direction protruding toward the rotating body 84 by an urging means (not shown) such as a coil spring. The reset operation portion 931 is formed in the cylindrical portion 933 so as to protrude in the operation direction E, and on the back side of the portion engaging with the guide portion 915 of the first cylindrical portion 911, the inner periphery of the first cylindrical portion 911 is formed. An inner wall surface portion 932 is formed so as to complement the surface. Four reset protrusions 934 are formed at equal intervals in the circumferential direction on the inner peripheral surface of the cylindrical portion 933 of the reset member 93. At one end of the reset protrusion 934 in the operation direction E, a reset guide slope 935 that is inclined at a constant angle with respect to the circumferential direction is formed.

  The cylindrical body 94 is inserted into the third cylindrical portion 913 and fixed at a predetermined position. That is, the cylindrical body 94 is provided in the third cylindrical portion 913 in a state where it does not rotate in the circumferential direction and is not displaced in the operation direction E. Four push latch protrusions 941 are formed on the inner peripheral surface of the cylindrical body 94 at equal intervals in the circumferential direction. The push latch protrusion 941 is formed at a position corresponding to the operation direction E with respect to the reset protrusion 934 of the reset member 93. A first guide slope 942, a second guide slope 943, and a locking portion 944 are formed at one end in the operation direction E of the push latch protrusion 941. The first guide slope 942 and the second guide slope 943 are slopes inclined at a constant angle with respect to the circumferential direction, and the inclination direction is the same as the inclination direction of the reset guide slope 935 of the reset member 93. The locking portion 944 will be described later.

  The operation shaft body 95 is disposed so as to be displaceable in the operation direction E and rotatable in the circumferential direction while being inserted through the cylindrical portion 933 and the cylindrical body 94 of the reset member 93. A first shaft portion 952, a second shaft portion 955, and a contact portion 958 are provided. The wave tooth contact portion 951 is formed at a position facing the wave tooth cam portion 922 of the push member 92. In addition, in the wave tooth abutting portion 951, up slopes and down slopes are alternately repeated in the circumferential direction to form four wave teeth at equal intervals in the circumferential direction. The first shaft portion 952 includes four first protrusions having slopes 954 that are inclined at a certain angle with respect to the circumferential direction at the end portions of the reset member 93 corresponding to the inner peripheral surface of the cylindrical portion 933. 953 are formed at equal intervals in the circumferential direction. The second shaft portion 955 has four second protrusions 956 in the circumferential direction in which a slope 957 inclined at a constant angle with respect to the circumferential direction is formed at a portion corresponding to the inner circumferential surface of the cylindrical body 94. It is formed at regular intervals. The four first protrusions 953 are formed at positions corresponding to the operation direction E with respect to the wave tooth valley portions of the wave tooth contact portion 951. The four second protrusions 956 are formed at positions corresponding to the operation direction E with respect to the four first protrusions 953. The contacted portion 722 of the swing member 72 is in contact with the contact portion 958, and the biasing force by the biasing means is applied via the swing member 72. That is, an urging force in a direction to contact the push member 92 acts on the operation shaft body 95.

<Push Latch Operation in Push Latch Mechanism 90>
The push latch operation in the push latch mechanism 90 will be described with reference to FIG.
FIG. 30 is an operation explanatory view schematically showing a push latch operation in the push latch mechanism 90. As shown in FIG.
Note that, in order to make the drawing easier to see, FIG. 30 is provided with reference numerals only in FIG. 30A, and FIGS. 30B to 30H are omitted in reference numerals.

First, the operation when the air release valve unit 70 is changed from the closed state to the open state will be described with reference to FIGS.
In the state where the four second protrusions 956 of the operating shaft body 95 enter between the push latch protrusions 941 of the cylindrical body 94, the push latch mechanism 90 is in a state where the atmosphere release valve unit 70 is closed ( FIG. 30 (a)).

  From this state, when the push latch cam 845 formed on the rotating body 84 is engaged with the push operation portion 921 of the push member 92, the push member 92 is displaced in the pushing direction E1. This push direction E1 is one direction of the operation direction E, the push operation portion 921 of the push member 92 is pushed by the push latch cam 845, and the reset operation portion 931 of the reset member 93 is reset. It is also the direction pushed by the cam 844. When the push member 92 is displaced in the pushing direction E <b> 1, the wave cam portion 922 of the push member 92 comes into contact with the wave tooth contact portion 951 of the operation shaft body 95 and resists the biasing force acting from the swing member 72. Then, the push member 92 pushes the operation shaft body 95 in the pushing direction E1. At this time, since the wave tooth cam portion 922 of the push member 92 and the wave tooth contact portion 951 of the operation shaft body 95 are in contact with each other, the biasing force acting from the swing member 72 A rotational force in the circumferential direction acts on the operation shaft body 95. However, while the four second protrusions 956 of the operation shaft body 95 are in a state where they enter between the push latch protrusions 941 of the cylindrical body 94, the rotation of the operation shaft body 95 in the circumferential direction is the push latch. It is locked by the ridge 941. Therefore, the operation shaft body 95 is displaced only in the pushing direction E1 during that time (FIG. 30B).

  When the push member 92 is further pushed in the pushing direction E1, the operation shaft body reaches a position where the four second protrusions 956 of the operation shaft body 95 are separated from the push latch protrusions 941 of the cylindrical body 94. 95 is displaced in the pushing direction E1. At that time, the locking of the operation shaft body 95 in the circumferential direction is released. For this reason, the urging force acting from the swing member 72 causes the wave portion cam portion 922 of the push member 92 and the crest portion of the wave shaft abutting portion 951 of the operation shaft body 95 to coincide with each other. The operating shaft body 95 is displaced while rotating in the direction along the tooth slope (symbol K). As a result, the operating shaft body 95 is displaced and rotated along a trajectory indicated by the symbol J, and the inclined surface 957 of the second protrusion 956 of the operating shaft body 95 is the second guide of the push latch protrusion 941 of the cylindrical body 94. It will be in the state contact | abutted to the slope 943 (FIG.30 (c)).

  When the push latch cam 845 moves away from the push operation portion 921 of the push member 92, the push latch cam 845 rotates in the direction along the second guide slope 943 of the push latch protrusion 941 of the cylindrical body 94 by the biasing force acting from the swing member 72. However, the operating shaft body 95 is displaced (reference numeral K). Then, the second protrusion 956 of the operation shaft body 95 abuts on the locking portion 944 of the push latch protrusion 941 of the cylindrical body 94. As a result, the state in which the operating shaft body 95 is locked to the cylindrical body 94 is maintained at that position. In this state, the atmosphere release valve unit 70 is opened (FIG. 30D). Further, the push member 92 is pushed by the operation shaft body 95 and displaced in the urging direction E2. This urging direction E2 is the other direction of the operation direction E, and is the direction of the urging force acting on the operation shaft body 95 via the swing member 72.

Next, the operation when the atmosphere release valve unit 70 is changed from the open state to the closed state will be described with reference to FIGS. 30 (e) to 30 (h).
When the push release cam 845 formed on the rotating body 84 is engaged with the push operation portion 921 of the push member 92 from the state in which the atmosphere release valve unit 70 is opened, the push member 92 is displaced in the pushing direction E1 (FIG. 30 (e)).

  When the push member 92 is displaced in the pushing direction E <b> 1, the wave cam portion 922 of the push member 92 comes into contact with the wave tooth contact portion 951 of the operation shaft body 95 and resists the biasing force acting from the swing member 72. Then, the push member 92 pushes the operation shaft body 95 in the pushing direction E1. At this time, since the wave tooth cam portion 922 of the push member 92 and the wave tooth contact portion 951 of the operation shaft body 95 are in contact with each other, the biasing force acting from the swing member 72 A rotational force in the circumferential direction acts on the operation shaft body 95. However, while the four second protrusions 956 of the operation shaft body 95 are locked to the locking portions 944 of the push latch protrusion 941 of the cylindrical body 94, the operation shaft body 95 extends in the circumferential direction. The rotation is locked. Accordingly, the operating shaft body 95 is displaced only in the pushing direction E1 during that time (FIG. 30 (f)).

  When the push member 92 is further pushed, the operation shaft body 95 reaches a position where the four second protrusions 956 of the operation shaft body 95 are disengaged from the locking portions 944 of the push latch protrusions 941 of the cylindrical body 94. Is displaced in the pushing direction E1. At that time, the locking of the operation shaft body 95 in the circumferential direction is released. Thereby, due to the urging force acting from the swing member 72, the trough portion of the wave cam portion 922 of the push member 92 and the crest portion of the wave tooth contact portion 951 of the operation shaft body 95 are brought into a state of matching. The operating shaft body 95 is displaced while rotating in the direction along the wave-tooth slope (symbol K). At the same time, the operating shaft body 95 is displaced and rotated along the trajectory indicated by the symbol J, and the slope 957 of the second protrusion 956 of the operating shaft body 95 is the first guide of the push latch protrusion 941 of the cylindrical body 94. It will be in the state contact | abutted to the slope 942 (FIG.30 (g)).

  When the push latch cam 845 is separated from the push operation portion 921 of the push member 92, the push latch cam 845 rotates in the direction along the first guide slope 942 of the push latch protrusion 941 of the cylindrical body 94 by the biasing force acting from the swing member 72. However, the operating shaft body 95 is displaced. As a result, the four second protrusions 956 of the operation shaft body 95 enter between the push latch protrusions 941 of the cylindrical body 94 (symbol L). Further, the push member 92 is pushed by the operation shaft body 95 and displaced in the urging direction E2. In this state, the atmosphere release valve unit 70 is closed (FIG. 30 (h)).

  In this way, the atmosphere release valve unit 70 can be switched alternately between the open state and the closed state by the push latch mechanism 90. That is, every time the push operation portion 921 of the push latch mechanism portion 90 is pushed, the atmosphere release valve unit 70 is alternately switched between an open state and a closed state. Further, since the push latch mechanism 90 is a mechanism that self-holds the operation state, the open / close state of the atmosphere release valve unit 70 is held by the push latch mechanism 90. Therefore, regardless of the sealing state of the head surface of the recording head 16 by the cap 40, the open / close state of the air release valve unit 70 can be switched and the open / closed state can be maintained. Accordingly, the head maintenance device 2 capable of sealing the head surface of the recording head 16 with a sufficient and stable contact state regardless of the open / close state of the atmosphere communication path by the atmosphere release valve unit 70 is realized with a low-cost configuration. Can do.

  The push latch mechanism 90 is not particularly limited to the aspect in the embodiment. That is, every time the operation unit is pushed, the open / close state of the atmosphere release valve unit 70 can be alternately switched, and any mechanism can be used as long as the operation state is self-holding. It may be a mechanism. For example, a push latch mechanism using a so-called heart cam can be used.

<Reset Operation in Push Latch Mechanism 90>
The reset operation in the push latch mechanism 90 will be described with reference to FIG.
FIG. 31 is an operation explanatory view schematically showing the reset operation in the push latch mechanism 90. FIG.
In addition, also in FIG. 31, in order to make it easy to see drawing, the code | symbol is attached | subjected only in FIG. 31 (a), and the code | symbol is abbreviate | omitted about FIG.

First, the reset operation in a state where the atmosphere release valve unit 70 is opened will be described with reference to FIGS. 31 (a) to 31 (e).
In a state where the second protrusion 956 of the operation shaft body 95 abuts on the locking portion 944 of the push latch protrusion 941 of the cylindrical body 94 and the operation shaft body 95 is locked to the cylindrical body 94 at that position, The state where the air release valve unit 70 is opened is maintained. In this state, the first protrusion 953 of the operation shaft body 95 is in a position corresponding to the operation direction E with respect to the reset protrusion 934 of the reset member 93. That is, the reset guide slope 935 of the reset member 93 and the slope 954 of the operation shaft body 95 face each other in a positional relationship that allows contact in the operation direction E (FIG. 31A).

  From this state, when the reset cam 844 formed on the rotating body 84 is engaged with the reset operation portion 931 of the reset member 93, the reset member 93 is displaced in the pushing direction E1. When the reset member 93 is displaced in the pushing direction E <b> 1, the reset guide slope 935 of the reset protrusion 934 comes into contact with the slope 954 of the first protrusion 953 of the operation shaft body 95 and acts from the swing member 72. The reset member 93 pushes the operating shaft body 95 in the pushing direction E1 against the urging force. At this time, since the reset member 93 and the operation shaft body 95 are in contact with each other at an inclined surface, a rotational force in the circumferential direction acts on the operation shaft body 95 by the biasing force acting from the swing member 72. However, while the four second protrusions 956 of the operation shaft body 95 are locked to the locking portions 944 of the push latch protrusion 941 of the cylindrical body 94, the operation shaft body 95 extends in the circumferential direction. The rotation is locked by the locking portion 944. Accordingly, during that time, the operating shaft body 95 is displaced only in the pushing direction E1 (FIG. 31 (b)).

  When the reset member 93 is further pushed, the operation shaft body 95 reaches a position where the four second protrusions 956 of the operation shaft body 95 are disengaged from the engaging portions 944 of the push latch protrusion 941 of the cylindrical body 94. Is displaced in the pushing direction E1. At that time, the locking of the operation shaft body 95 in the circumferential direction is released. Accordingly, the operating shaft body 95 is displaced while being rotated in the direction along the reset guide slope 935 of the reset member 93 by the urging force acting from the swing member 72 (reference numeral M). At the same time, the operating shaft body 95 is displaced and rotated along the trajectory indicated by the symbol J, and the inclined surface 957 of the second protrusion 956 of the operating shaft body 95 is the first guide of the push latch protrusion 941 of the cylindrical body 94. It will be in the state contact | abutted to the slope 942 (FIG.31 (c)).

  The operating shaft body 95 is displaced while being rotated in a direction along the first guide slope 942 of the push latch protrusion 941 of the cylindrical body 94 by the urging force acting from the swing member 72. As a result, the four second protrusions 956 of the operation shaft body 95 enter between the push latch protrusions 941 of the cylindrical body 94 (symbol L). Here, as described above, the operation shaft body 95 has four second protrusions 956 formed at positions corresponding to the operation direction E with respect to the four first protrusions 953. The reset member 93 has a reset protrusion 934 formed at a position corresponding to the operation direction E with respect to the push latch protrusion 941 of the cylindrical body 94. Therefore, in a state in which the four second protrusions 956 of the operation shaft body 95 enter between the push latch protrusions 941 of the cylindrical body 94, the four first protrusions 953 of the operation shaft body 95 are formed on the reset member 93. It will be in the state which entered between the protrusions 934 for reset (code | symbol L). In this state, the atmosphere release valve unit 70 is closed (FIG. 31 (d)). When the reset cam 844 is separated from the reset operation portion 931 of the reset member 93, the reset member 93 is displaced in the urging direction E2 by the urging force of the urging means (not shown) (FIG. 31 (e)).

Next, the reset operation in a state where the atmosphere release valve unit 70 is closed will be described with reference to FIGS. 31 (e) to 31 (g).
In the state where the four second protrusions 956 of the operation shaft body 95 enter between the push latch protrusions 941 of the cylindrical body 94, the atmosphere release valve unit 70 is closed. Further, in this state, the four first protrusions 953 of the operation shaft body 95 enter between the reset protrusions 934 of the reset member 93 (FIG. 31 (e)).

  From this state, when the reset cam 844 formed on the rotating body 84 is engaged with the reset operation portion 931 of the reset member 93, the reset member 93 is displaced in the pushing direction E1. However, at this time, the reset protrusion 934 of the reset member 93 only enters the state between the first protrusions 953 of the operation shaft body 95 (FIG. 31 (f)). Therefore, the operating shaft body 95 is not pushed in the pushing direction E1 by the reset protrusion 934 of the reset member 93. That is, in the state where the atmosphere release valve unit 70 is closed, even if the reset member 93 reciprocates in the operation direction E, the reset protrusion 934 only swings between the first protrusions 953 of the operation shaft body 95. . Therefore, the operating shaft body 95 is not displaced in the pushing direction E1, and the state where the atmosphere release valve unit 70 is closed does not change. When the reset cam 844 is separated from the reset operation portion 931 of the reset member 93, the reset member 93 is displaced in the urging direction E2 by the urging force of the urging means (not shown) (FIG. 31 (g)).

  In this way, according to the push latch mechanism unit 90 provided with the “reset mechanism”, when the atmosphere release valve unit 70 is open, the atmosphere release valve unit 70 is operated by the reset operation by the pushing operation of the reset operation unit 931. Can be forced into a closed state. On the other hand, when the atmosphere release valve unit 70 is closed, the state where the atmosphere release valve unit 70 is closed does not change even if the reset operation unit 931 is pushed. That is, when the reset operation by the pushing operation of the reset operation unit 931 is performed, it is guaranteed that the atmosphere release valve unit 70 is always closed. Accordingly, it is possible to accurately specify the open / close state of the air release valve unit 70 in any case without providing a sensor capable of detecting the open / close state of the air release valve unit 70.

<Configuration of Driving Force Transmission Mechanism 80>
The configuration of the driving force transmission mechanism 80 will be described with reference to FIGS.
FIG. 32 is a perspective view illustrating a portion where the driving force transmission mechanism 80 of the maintenance unit 3 is provided. FIG. 33 is an exploded perspective view of a portion where the driving force transmission mechanism 80 of the maintenance unit 3 is provided. FIG. 34 is a perspective view of the driving force transmission mechanism 80. FIG. 35 is a perspective view illustrating the planetary gear mechanism portion of the driving force transmission mechanism 80. FIG. 36 is a perspective view illustrating a meshing structure between the intermittent gear portion 842 of the rotating body 84 and the planetary gear 87, and FIG. 37 is a bottom view thereof.

  As described above, the driving force transmission mechanism 80 provided in the unit base 30 includes the mechanisms (the driving gear 381 and the pump gear 371) that transmit the driving force of the maintenance unit motor 38 to the suction pump 37 (see FIG. 6). In addition, the driving force transmission mechanism 80 further includes a rotating body as a mechanism for operating the left cam structure 81, the right cam structure 82, and the atmosphere release valve unit 70 with the driving force of the maintenance unit motor 38. 84, a sun gear 85, a planetary lever 86, and a planetary gear 87.

  As described above, the cam shaft 83 that rotatably supports the left cam structure 81 and the right cam structure 82 independently of each other is provided between the support groove 363 of the cover member 36 and the base member 39 constituting the unit base 30. It is fixed to a support part composed of a part. The left cam structure 81 is disposed at a position where the lower half enters the hole 361 formed in the cover member 36, and the right cam structure 82 is formed in the hole 362 formed in the cover member 36. Is disposed at a position where the lower half enters. The gear portion 811 of the left cam structure 81 and the gear portion 821 of the right cam structure 82 mesh with the cam drive gear portion 841 of the rotating body 84 disposed inside the cover member 36. The gear portion 811 of the left cam structure 81, the gear portion 821 of the right cam structure 82, and the cam drive gear portion 841 of the rotating body 84 have a substantially conical shape, and teeth are carved on the peripheral surface of the conical portion. This is a so-called bevel gear.

  The sun gear 85 is a two-stage gear having a first gear portion 851 configured with teeth formed on the outer peripheral surface and a second gear portion 852 configured with teeth formed on the outer peripheral surface of the bearing portion 854. is there. The sun gear 85 is pivotally supported by the support shaft 352 in a state where the support shaft 352 standing on the support plate 35 constituting the unit base 30 is inserted through the bearing portion 854. The first gear portion 851 of the sun gear 85 meshes with a gear 385 that is housed and disposed in the gear housing portion 365 of the cover member 36. In other words, the sun gear 85 rotates when the driving force of the maintenance unit motor 38 is transmitted through the gear 383, the rotation transmission shaft 384 and the gear 385.

  The planetary lever 86 can swing in the swing direction N in a state where the arm support portion 853 of the sun gear 85 (a portion where teeth are not formed on the outer peripheral surface of the bearing portion 854) is inserted into the cylindrical portion 861. The sun gear 85 is supported by a bearing portion 854. An arm portion 863 projects from the cylindrical portion 861 of the planetary lever 86. The distal end portion of the arm portion 863 is engaged with a swing restricting hole 364 formed at a corresponding position of the cover member 36, thereby limiting the swing range of the planetary lever 86 to a certain range. .

  The planetary gear 87 is pivotally supported by a shaft portion 862 formed on the arm portion 863 of the planetary lever 86 and meshes with the second gear portion 852 of the sun gear 85.

  The rotating body 84 is pivotally supported by the support shaft 352 with the upper portion of the support shaft 352 inserted through the bearing hole 846. On the upper surface of the rotating body 84, the cam drive gear portion 841 (cam drive gear) that meshes with the gear portion 811 of the left cam structure 81 and the gear portion 821 of the right cam structure 82 is formed. An intermittent gear portion 842 that meshes with the planetary gear 87 within a range where teeth are formed is formed on the inner peripheral surface of the rotating body 84. Further, a reset cam 844 and a push latch cam 845 that engage with the push latch mechanism 90 are formed on the outer peripheral surface of the rotating body 84 with a step in the Z direction so as not to overlap in the circumferential direction.

  In the driving force transmission mechanism 80 having such a configuration, the intermittent gear portion 842 of the rotating body 84 meshes with the planetary gear 87 in a range where teeth are formed (in the present embodiment, a range of about 350 degrees). Then, the rotation of the sun gear 85 is transmitted to the intermittent gear portion 842 via the planetary gear 87, and the rotating body 84 rotates. When the rotating body 84 rotates to a position where the intermittent portion 843 (portion where the teeth are not formed) of the intermittent gear portion 842 reaches the planetary gear 87, the planetary gear 87 is idled. Even if the sun gear 85 is rotated by the driving force of the motor 38, the rotating body 84 is not rotated. Further, when the rotation direction of the sun gear 85 is reversed from this state, the planetary lever 86 is swung within a certain rocking range (the rocking range restricted by the rocking restriction hole 364) in the rotating direction after the reverse rotation. Thereby, the planetary gear 87 meshes with the portion where the teeth of the intermittent gear portion 842 are formed. As a result, the rotation of the sun gear 85 is transmitted to the intermittent gear portion 842 via the planetary gear 87 and the rotating body 84 rotates.

<Operation of Driving Force Transmission Mechanism 80>
The operation of the driving force transmission mechanism 80 will be described with reference to FIG.
FIG. 38 is an operation explanatory diagram illustrating the operation state of the maintenance unit 3 in association with the rotation position of the rotating body 84.

  Here, reference signs R0 to R6 indicate the rotational position or rotational range of the rotating body 84 with the reference point S as a reference. The reference point S coincides with the positions of the push operation unit 921 and the reset operation unit 931 of the push latch mechanism unit 90. Similarly, reference signs D1 to D5 indicate the rotation range of the rotating body 84 with the reference point S as a reference. The rotation ranges D1 to D5 are illustrated by associating the rotation ranges D1 to D5 of the right cam structure 82 shown in FIG. 19 with the rotation ranges of the rotation body 84 (not shown, but the left cam structure The same applies to 81.)

  When the maintenance unit 3 rotates the maintenance unit motor 38 in the forward direction (CW), the rotating body 84 rotates in the forward direction FR, and when the maintenance unit motor 38 rotates in the reverse direction (CCW), the rotating body 84 rotates in the reverse direction. Rotate to RR. When the rotating body 84 rotates in the forward direction FR, both the left cam structure 81 and the right cam structure 82 rotate in the forward direction FD, and when the rotating body 84 rotates in the reverse direction RR. The left cam structure 81 and the right cam structure 82 both rotate in the reverse rotation direction RD.

  The rotation range R0 corresponds to the intermittent portion 843 of the intermittent gear portion 842. That is, the rotation range R0 is a range in which the planetary gear 87 idles without meshing with the intermittent gear portion 842 (hereinafter referred to as “idle rotation range R0”). Therefore, in the idling range R0, even if the sun gear 85 is rotated by the driving force of the maintenance unit motor 38, the rotating body 84 is not rotated. That is, in the idling range R0, the suction pump 37 continues to operate with the driving force of the maintenance unit motor 38, while the rotation of the rotating body 84 is maintained in a stopped state.

  The rotational position R1 is a rotational position where the planetary gear 87 starts to idle when the rotating body 84 is rotated in the normal rotation direction FR, and is the starting point of the idle rotation range R0 in the normal rotation direction FR. That is, if the sun gear 85 is continuously rotated in the rotation direction in which the rotating body 84 rotates in the forward rotation direction FR, when the rotational position R1 reaches the reference point S, the planetary gear 87 is idled and the rotating body 84 is rotated. The above is a state where the motor does not rotate in the forward rotation direction FR (hereinafter referred to as “idle start position R1”).

  The rotation ranges R2 to R6 are set to a rotation range other than the idling range R0, that is, a range in which the planetary gear 87 meshes with the intermittent gear portion 842 and the rotating body 84 can rotate.

  The rotation range R2 is a rotation range in which the atmosphere release valve unit 70 can be opened and closed. That is, in the rotation range R2, the push operation portion 921 of the push latch mechanism portion 90 is engaged with the push latch cam 845 and the push member 92 is pushed (hereinafter referred to as “push operation range R2”). Then, at the idling start position R1 or the rotation range R3 adjacent to the push operation range R2, the push latch cam 845 is separated from the push operation portion 921 of the push latch mechanism portion 90. Therefore, for example, the opening / closing operation of the atmosphere release valve unit 70 can be performed by rotating the rotating body 84 so as to reciprocate between the push operation range R2 and the rotation range R3. Alternatively, the open / close operation of the atmosphere release valve unit 70 can be performed even if the rotating body 84 is rotated so as to reciprocate between the idling start position R1 and the push operation range R2. Alternatively, the open / close operation of the atmosphere release valve unit 70 can also be performed by rotating the rotating body 84 from the idling start position R1 to the rotation range R3 or from the rotation range R3 to the idling start position R1.

  The rotation range R2 and the rotation range R3 correspond to the rotation range D1 of the left cam structure 81 and the right cam structure 82. Therefore, in the rotation range R2 and the rotation range R3, the head guide 50 and the wiper unit 60 are both maintained in the state displaced to the uppermost position in the Z direction (FIG. 20). That is, the cap 40 is sealed on the head surface of the recording head 16 in a state where the relative positional relationship between the recording head 16 and the cap 40 in the direction along the head surface of the recording head 16 is regulated by the guide portion 51 of the head guide 50. The stop surface 411 can be brought into close contact.

  The rotation range RG corresponds to the rotation range D2 of the left cam structure 81 and the right cam structure 82, and is a rotation range in which the head guide 50 is displaced (hereinafter referred to as “head guide operation range RG”). That is, in the head guide operation range RG, as described above, the wiper unit 60 can move only the head guide 50 up and down (displace in the Z direction) while maintaining the state displaced to the uppermost position in the Z direction ( FIG. 21). Further, since the head guide operation range RG is set to a range that does not overlap with the push operation range R2, only the head guide 50 can be moved up and down while maintaining the open / close state of the atmosphere release valve unit 70. Further, in the head guide operation range RG, the first wiper 63 can be cleaned by the wiper cleaner 58 as described above by moving only the head guide 50 up and down.

  The rotation range R4 corresponds to the rotation range D3 of the left cam structure 81 and the right cam structure 82. That is, in the rotation range R4, as described above, the state in which the first wiper 63 protrudes from the guide portion 51 of the head guide 50 toward the recording head 16 is maintained (FIG. 22). In this state, as described above, the head surface of the recording head 16 can be wiped with the first wiper 63 (hereinafter referred to as “wiping execution range R4”).

  The rotation range RY corresponds to the rotation range D4 of the left cam structure 81 and the right cam structure 82, and is a rotation range in which the wiper unit 60 is displaced (hereinafter referred to as “wiper operation range RY”). That is, in the wiper operation range RY, as described above, the head guide 50 can move only the wiper unit 60 up and down (displace in the Z direction) while maintaining the state displaced to the lowest position in the Z direction. Further, since the wiper operation range RY is set to a range that does not overlap with either the push operation range R2 or the head guide operation range RG, only the wiper unit 60 is moved up and down while the open / close state of the air release valve unit 70 is maintained. be able to. Further, in the wiper operation range RY, the first wiper 63 can be cleaned by the wiper cleaner 58 as described above by moving only the wiper unit 60 up and down.

  The rotation range R5 corresponds to the rotation range D5 of the left cam structure 81 and the right cam structure 82. That is, in the rotation range R5, as described above, the sealing surface 411 of the cap 40 protrudes from the protruding end of the guide portion 51 of the head guide 50 and the leading end 631 of the first wiper 63 to the head surface side of the recording head 16. (FIG. 9B). That is, it is possible to perform flushing while maintaining the distance between the head surface of the recording head 16 and the sealing surface 411 of the cap 40 at an interval suitable for flushing (hereinafter referred to as “recording execution range R5”). ). That is, when recording on the recording paper P, the rotating body 84 may be rotated up to the recording execution range R5 (up to a position where the reference point S is within the recording execution range R5).

  The rotation range R6 is a rotation range in which the latch of the push latch mechanism 90 can be reset to forcibly close the atmosphere release valve unit 70 (hereinafter referred to as “reset operation range R6”). . That is, in the reset operation range R6, the reset operation portion 931 of the push latch mechanism portion 90 is engaged with the reset cam 844 and the reset member 93 is pushed. In the recording execution range R5 adjacent to the reset operation range R6, the reset cam 844 is separated from the reset operation unit 931 of the push latch mechanism unit 90. Therefore, for example, the atmosphere release valve unit 70 can be forcedly closed by rotating the rotating body 84 so as to reciprocate between the recording execution range R5 and the reset operation range R6. The reset operation range R6 is set to a range that does not overlap any of the push operation range R2, the head guide operation range RG, and the wiper operation range RY. Therefore, the push latch mechanism 90 can be reset while the head guide 50 and the wiper unit 60 are displaced to the lowermost position in the Z direction. Further, the reset operation range R6 corresponds to the rotation range D5 of the left cam structure 81 and the right cam structure 82. Therefore, for example, the push latch mechanism 90 can be reset while recording on the recording paper P is being executed.

<Control procedure of head maintenance device 2>
An example of the control procedure of the head maintenance device 2 will be described with reference to FIG. A control procedure for maintaining the recording head 16 described below is executed by the control device 100.
FIG. 39 is a timing chart illustrating the control procedure of the head maintenance device 2.

  In the state where the power of the inkjet printer 1 is OFF, the position of the maintenance unit 3 in the Z direction is in the sealing position, the head surface of the recording head 16 is sealed with the cap 40, and the air release valve unit 70 is closed. State. After the ink jet printer 1 is powered on, as a procedure for initializing the maintenance unit 3, first, a reset operation of the push latch mechanism 90 is executed to determine a state in which the air release valve unit 70 is closed. Normally, the atmosphere release valve unit 70 is closed when the power is turned off, but if it is opened for some reason, the contents of the opening / closing control of the atmosphere release valve unit 70 and the actual opening / closing are performed. This is because there is a possibility that the state does not match.

  More specifically, after the ink jet printer 1 is powered on, first, the maintenance unit motor 38 is reversely rotated (CCW) to rotate the rotating body 84 in the reverse rotation direction RR up to the reset operation range R6. As a result, the reset cam 844 is engaged with the reset operation portion 931 of the push latch mechanism portion 90, and the reset operation of the push latch mechanism portion 90 is performed. The reset cam 844 is provided at a position straddling the reset operation range R6 and the idling range R0. Therefore, in order to perform a reliable reset operation, the rotation amount when rotating the rotating body 84 to the reset operation range R6 by rotating the maintenance unit motor 38 in the reverse direction (CCW) is at any rotational position. Also, it is preferable to set the amount of rotation sufficient to be in the idling state in the idling range R0.

  The reset operation of the push latch mechanism 90 can be executed at any time other than when the ink jet printer 1 is powered on. For example, it is determined that there is a possibility that the contents of the open / close control of the atmosphere release valve unit 70 and the actual open / close state do not coincide with each other even during the execution of recording or the maintenance operation of the print head 16. In some cases, the reset operation of the push latch mechanism 90 may be performed again in order to avoid malfunction more reliably.

  After the reset operation of the push latch mechanism 90, the push operation of the push latch mechanism 90 by the push latch cam 845 is executed only once, and the atmosphere release valve unit 70 is opened. More specifically, by rotating the maintenance unit motor 38 forward (CW), the rotating body 84 is rotated in the forward rotation direction FR up to the push operation range R2. As a result, the push latch cam 845 is engaged with the push operation portion 921 of the push latch mechanism portion 90, and the atmosphere release valve unit 70 is opened. This open state is held by the push latch mechanism 90 (operation state: initialization).

  The suction pump 37, which is a known tube pump, performs a suction operation for generating a negative pressure when the maintenance unit motor 38 is driven forward as described above, and the maintenance unit motor 38 is driven reversely. When it is released, it becomes a release state and no negative pressure is generated. Further, when the rotation direction of the pump gear 371 is switched from reverse rotation to normal rotation, the rotation transmission is delayed by a rotation amount less than one rotation. Therefore, the suction pump 37 operates only in a state where the maintenance unit motor 38 is rotated forward (CW) at the idling start position R1.

  When recording is performed on the recording paper P after the maintenance unit 3 is initialized, the rotating body 84 is first rotated to the recording execution range R5 by reversing the maintenance unit motor 38 (CCW). As a result, the sealing surface 411 of the cap 40 protrudes from the protruding end of the guide portion 51 of the head guide 50 and the tip 631 of the first wiper 63 toward the head surface of the recording head 16. Further, after at least the head guide 50 is displaced to the uppermost end position (second displacement position) in the Z direction, the entire maintenance unit 3 is lowered to the recording position by the elevating device 23. Accordingly, the cap 40 is separated from the recording head 16, and the sealing of the head surface of the recording head 16 by the cap 40 can be released. Further, the interval between the head surface of the recording head 16 and the sealing surface 411 of the cap 40 can be set to an interval suitable for flushing so that recording on the recording paper P can be performed (operation state: recording). During).

  When performing this suction operation after recording on the recording paper P, first, the maintenance unit motor 38 is rotated forward (CW) to rotate the rotating body 84 to the idling start position R1. At this time, after the rotation range R3, the state in which the head guide 50 and the wiper unit 60 are both displaced to the uppermost position in the Z direction is maintained. Therefore, the cap 40 is sealed on the head surface of the recording head 16 in a state where the relative positional relationship between the recording head 16 and the cap 40 in the direction along the head surface of the recording head 16 is regulated by the guide portion 51 of the head guide 50. The stop surface 411 can be brought into close contact.

  Further, in the process of rotating the rotating body 84 to the idling start position R1 through the push operation range R2, the push operation of the push latch mechanism 90 by the push latch cam 845 is executed once, and the atmosphere release valve unit 70 is opened. Switch from closed state to closed state (operation state: preparation for suction). This closed state is held by the push latch mechanism 90.

  Then, after the rotating body 84 rotates to the rotation range R3, the entire maintenance unit 3 is raised to the sealing position by the elevating device 23. As a result, the sealing surface 411 of the cap 40 comes into contact with and closely contacts the head surface of the recording head 16 (operation state: preparation for suction). From this state, the maintenance unit motor 38 continues to rotate forward (CW), whereby the suction pump 37 operates to perform the main suction operation (suction operation with the atmosphere release valve unit 70 closed). . At this time, the rotating body 84 is maintained in a stopped state at the idling start position R1 because the planetary gear 87 is idling (operating state: main suction).

  In this embodiment, with the atmosphere release valve unit 70 closed, the sealing surface 411 of the cap 40 is brought into contact with the head surface of the recording head 16 so that the meniscus is destroyed. It is considered that this pressure fluctuation hardly affects the head surface of the recording head 16. However, in order to reduce the risk of meniscus destruction due to pressure fluctuations as much as possible, for example, after the atmosphere release valve unit 70 is once opened, the sealing surface 411 of the cap 40 is brought into contact with the head surface of the recording head 16. Then, the suction operation may be executed by switching the air release valve unit 70 to a closed state after that.

  After performing this suction operation, the idle suction operation can be continuously performed while maintaining the state where the head surface of the recording head 16 is sealed with the cap 40. First, the rotating body 84 is rotated to the push operation range R2 by reversing the maintenance unit motor 38 (CCW). Subsequently, the maintenance unit motor 38 is rotated forward (CW) to rotate the rotating body 84 again to the idling start position R1. Thereby, the push operation of the push latch mechanism 90 by the push latch cam 845 is executed once, and the atmosphere release valve unit 70 is switched from the closed state to the open state (operation state: idle suction preparation). This open state is held by the push latch mechanism 90. From this state, the maintenance unit motor 38 is further rotated forward (CW), whereby the suction pump 37 is operated to perform an idle suction operation (a suction operation with the atmosphere release valve unit 70 opened). . At this time, the rotating body 84 is maintained in a stopped state at the idling start position R1 because the planetary gear 87 is idling (operating state: idling).

  When the main suction operation is performed again after the idle suction operation is performed, the maintenance unit motor 38 is reversely rotated (CCW) to rotate the rotating body 84 to the push operation range R2, and further the maintenance unit motor 38. Is rotated forward (CW) and the rotating body 84 is rotated again to the idling start position R1. Accordingly, the open air release valve unit 70 can be switched to the closed state again while maintaining the state where the head surface of the recording head 16 is sealed with the cap 40. In other words, the maintenance unit 3 according to the present invention can perform the main suction operation and the idle suction operation by rotating the rotating body 84 so as to reciprocate between the idling start position R1 and the push operation range R2. Can be switched alternately. Therefore, the main suction operation and the idle suction operation can be alternately repeated as many times as necessary. If it is not necessary to perform the main suction operation and the idle suction operation after the recording on the recording paper P, if the rotation body 84 is not rotated to the idling start position R1, the main suction operation and The wiping described below can also be executed without performing the idle suction operation.

  After performing recording on the recording paper P, wiping can be performed after performing the main suction operation and the idle suction operation as necessary. First, the rotating body 84 is rotated to the wiping execution range R4 by reversing the maintenance unit motor 38 (CCW). As a result, the first wiper 63 protrudes from the guide portion 51 of the head guide 50 toward the recording head 16. At this time, in the process in which the rotating body 84 rotates from the idling start position R1 to the wiping execution range R4, the push latch mechanism 90 is pushed once by the push latch cam 845, and the atmosphere release valve unit 70 is opened. Switch from closed to closed.

  Further, in the process in which the rotating body 84 rotates from the idling start position R1 to the wiping execution range R4, when the head guide 50 descends in the head guide operation range RG, the wiper cleaner 58 extends from the tip 631 to the side surface of the first wiper 63. The first wiper 63 is cleaned before the wiping in sliding contact. At this time, since it is a stage before wiping, it is considered that ink is hardly attached to the first wiper 63 in many cases. However, some foreign matters such as paper dust and dust generated during recording on the recording paper P may float and adhere to the first wiper 63. If foreign matter such as paper dust or dust adhered to the first wiper 63 adheres to the head surface of the recording head 16 during wiping, there is a risk of causing clogging of the ink ejection nozzles. That is, the cleaning operation of the first wiper 63 performed before wiping is significant in that foreign matters such as paper dust and dust attached to the first wiper 63 can be mainly removed before wiping.

  Then, after the head guide 50 is displaced to the uppermost position (second displacement position) in the Z direction, the entire maintenance unit 3 is moved to the wiping position by the lifting device 23 (operation state: preparation for wiping). This wiping position is set between the sealing position and the recording position, and is a position at which the tip 631 of the first wiper 63 can slide in contact with the head surface of the recording head 16. From this state, the entire maintenance unit 3 is displaced in the X direction from the home position to the wiping end position by the slide device 22, and wiping is performed in which the tip 631 of the first wiper 63 is brought into sliding contact with the head surface of the recording head 16. . As a result, the adhering matter adhering to the head surface of the recording head 16 can be removed (operation state: wiping).

  After executing the wiping, the rotating unit 84 is rotated to the recording execution range R5 by reversing the maintenance unit motor 38 (CCW). As a result, the wiper unit 60 is displaced from the uppermost position in the Z direction to the lowermost position, and in the process, the wiper cleaner 58 is slidably contacted from the tip 631 to the side surface of the first wiper 63, and the first first time after wiping. A cleaning operation of the wiper 63 is performed (operation state: wiping completed to wiper return). The main purpose of the cleaning operation after wiping is to remove ink attached to the first wiper 63. After the wiping is performed, the entire maintenance unit 3 is displaced in the X direction to the home position by the slide device 22, and the entire maintenance unit 3 is lowered to the standby position by the lifting device 23.

  When the head surface of the recording head 16 shifts to the stop state sealed with the sealing surface 411 of the cap 40 after execution of the series of wiping procedures, the following procedure may be executed. First, the rotating body 84 is rotated to the push operation range R2 by causing the maintenance unit motor 38 to rotate forward (CW). From there, the maintenance unit motor 38 is reversely rotated (CCW) to rotate the rotating body 84 to the rotation range R3, and then the maintenance unit motor 38 is rotated forward (CW) again to the idling start position R1. 84 is rotated. Accordingly, the push operation of the push latch mechanism 90 by the push latch cam 845 is executed twice, and the atmosphere release valve unit 70 is switched from the closed state to the opened state and then is closed again. . This closed state is held by the push latch mechanism 90. Such an operation is executed when the rotating body 84 is rotated from the recording execution range R5 to the idling start position R1 with the atmosphere release valve unit 70 closed, even at the idling start position R1. This is because 70 is closed.

  Further, in the process in which the rotating body 84 rotates from the recording execution range R5 to the idling start position R1, when the wiper unit 60 moves up in the wiper operation range RY, the wiper cleaner 58 slides from the tip 631 to the side surface of the first wiper 63. In contact therewith, the first wiper 63 is cleaned for the second time after wiping. Further, when the head guide 50 moves up in the head guide operation range RG, the wiper cleaner 58 comes into sliding contact again from the tip 631 to the side surface of the first wiper 63, and the first wiper 63 is cleaned for the third time after wiping. Is called.

  As described above, the cleaning operation of the first wiper 63 can be performed a plurality of times without causing unnecessary operations in a series of maintenance operations. Accordingly, it is possible to reliably reduce the possibility that all the deposits attached to the first wiper 63 cannot be removed without reducing the throughput of the inkjet printer 1. Further, the cleaning operation of the first wiper 63 performed before wiping can mainly remove foreign matters such as paper dust and dust attached to the first wiper 63 before wiping. On the other hand, the cleaning operation of the first wiper 63 performed after wiping can mainly remove the ink attached to the first wiper 63. That is, various deposits attached to the first wiper 63 can be rationally removed by the cleaning operation before and after wiping, and the possibility that all the deposits attached to the first wiper 63 cannot be removed can be further reduced.

  After the rotation range R3, the state in which the head guide 50 and the wiper unit 60 are both displaced to the uppermost position in the Z direction is maintained. As a result, the relative positional relationship between the recording head 16 and the cap 40 in the direction along the head surface of the recording head 16 is regulated by the guide portion 51 of the head guide 50, and the cap 40 is placed on the head surface of the recording head 16. The sealing surface 411 can be brought into close contact (operation state: cap preparation). Then, after the rotating body 84 rotates to the rotation range R3, the entire maintenance unit 3 is raised to the sealing position by the elevating device 23. As a result, the sealing surface 411 of the cap 40 comes into contact with and closely contacts the head surface of the recording head 16, and the head surface of the recording head 16 is sealed by the sealing surface 411 of the cap 40 (operation state: Stop).

  As described above, the head maintenance device 2 according to the present invention is driven by the driving force of the maintenance unit motor 38 that drives the suction pump 37, opens and closes the air release valve unit 70, and moves the first wiper 63. The maintenance operation can be performed by flexibly selecting the main suction operation, the idle suction operation, the wiping, and a combination thereof.

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

  For example, the present invention can also be implemented in a so-called serial head type ink jet printer. More specifically, the same number of maintenance units 3 as the number of recording heads mounted on the carriage (usually one) may be provided on the base 21 of the head maintenance device 2. Further, in the serial head type ink jet printer, since the wiping can be performed by moving the carriage, the slide device 22 of the head maintenance device 2 may not be provided.

DESCRIPTION OF SYMBOLS 1 Inkjet printer, 2 Head maintenance apparatus, 3 Maintenance unit, 16 Recording head, 22 Slide apparatus, 23 Lifting apparatus, 30 Unit base, 37 Suction pump, 38 Maintenance unit motor, 39 Base member, 40 Cap, 41 Sealing part 42 Cap body, 50 head guide, 51 guide portion, 55 first contacted portion, 56 second contacted portion, 57 third contacted portion, 58 wiper cleaner, 60 wiper unit, 61 wiper support member, 62 1st wiper attachment member, 63 1st wiper, 64 2nd wiper attachment member, 65 2nd wiper, 70 atmosphere release valve unit, 71 unit housing, 72 swing member, 73 support member, 74 valve body support part, 75 Valve seat, 80 Driving force transmission mechanism, 81 Left cam structure, 82 Right cam Structure, 83 Cam shaft, 84 Rotating body, 85 Sun gear, 86 Planetary lever, 87 Planetary gear, 90 Push latch mechanism, 91 Mechanism body, 92 Push member, 93 Reset member, 94 Cylinder, 95 Operation shaft , 100 controller

Claims (3)

A head maintenance device for maintaining the liquid ejecting head of a liquid ejecting apparatus that ejects liquid onto a material to be ejected from a liquid ejecting nozzle provided on a head surface of the liquid ejecting head,
Including one or more maintenance units supported by the apparatus base so as to be displaceable in a predetermined displacement direction that intersects the head surface of the liquid jet head;
The maintenance unit is
A sealing member capable of sealing the head surface of the liquid jet head;
A suction pump capable of sucking a suction path communicating with the sealing surface of the sealing member;
An atmosphere communication path with one side communicating with the sealing surface of the sealing member and the other side open to the atmosphere;
An atmosphere release valve capable of opening and closing the atmosphere communication path;
And a push latch mechanism for opening and closing the atmosphere release valve.   2. The head maintenance device according to claim 1, wherein the maintenance unit has a reset mechanism capable of resetting a latch of the push latch mechanism. A liquid ejecting apparatus that ejects liquid from a liquid ejecting nozzle provided on a head surface of a liquid ejecting head to a material to be ejected,
A liquid ejecting apparatus comprising the head maintenance device according to claim 1.

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