JP5682296B2 - Screw fixing structure in liquid ejecting head holding mechanism - Google Patents

Description

  The present invention relates to a screw fixing structure in a liquid ejecting head holding mechanism.

  2. Description of the Related Art Conventionally, as a liquid ejecting apparatus, there is an ink jet printer that performs printing processing on paper or the like by ejecting ink (liquid) from a liquid ejecting head unit in which a plurality of liquid ejecting heads are unitized (for example, Patent Documents). 1). In the printer of Patent Document 1, ink is supplied to the liquid ejecting head unit through the main channel member.

JP 2010-6049 A

  By the way, in the printer of Patent Document 1, the liquid ejecting heads are held on a platform (holding frame) in a state of being positioned with respect to each other, and a trunk channel holding member that holds a trunk channel member is screwed to the platform. It is fixed. For this reason, when the main channel holding member is screwed to the platform, the platform is displaced by the rotational force of the screw, which may cause the liquid jet head to be displaced.

  Such a problem is not limited to the case where the main channel holding member is fixed by screwing to the platform. For example, a liquid for supplying a liquid to the liquid ejecting head, such as a channel forming member in which a liquid supply channel is formed. This can also occur in common when any constituent member constituting the supply mechanism is fixed to the holding frame holding the liquid jet head.

  SUMMARY An advantage of some aspects of the invention is that a liquid ejecting head holding mechanism for holding a liquid ejecting head has a liquid ejecting mechanism in which a component member of the mechanism is screwed and fixed. An object of the present invention is to provide a screw fixing structure in a liquid ejecting head holding mechanism that can suppress displacement of the ejecting head.

In order to achieve the above object, the screw fixing structure in the liquid ejecting head holding mechanism of the present invention includes a holding frame for holding the liquid ejecting head and a fixed member fixed to the holding frame by a screw tightening force. Protrusions projecting toward the other side of the screw in the axial direction of the screw toward the other and deformed by a rotational force received from the screw and a reaction force received from the other side when the screw is tightened A flat plate-like reinforcing member is disposed between the fixed member and the holding frame, and the protruding portion is longer than the reinforcing member in the axial direction of the screw.

According to this configuration, since the projecting portion is crushed and deformed when the screw is tightened, the transmission of the rotational force to the holding frame via the fixed member is suppressed, so that the fixed member is suppressed while suppressing the displacement of the holding frame. Can be fixed. Therefore, for example, when a fixed member such as a constituent member of the liquid supply mechanism is fixed to the holding frame that holds the liquid ejecting head by the tightening force of the screw, the displacement of the liquid ejecting head can be suppressed. Furthermore, since the protruding portion is longer than the reinforcing member in the axial direction of the screw, the protruding portion can be brought into contact with the holding frame side even when the reinforcing member is disposed between the fixed member and the holding frame. .

  In the screw fixing structure in the liquid ejecting head holding mechanism of the present invention, the fixed member is provided with an insertion hole for inserting the screw, and the protrusion is formed in the axial direction of the screw in the fixed member. An annular shape is formed so as to surround the insertion hole on the side facing the holding frame.

According to this configuration, since the projecting portion is formed in an annular shape so as to surround the insertion hole, transmission of the rotational force to the holding frame in the rotation direction of the screw can be evenly suppressed.
In the screw fixing structure in the liquid ejecting head holding mechanism of the present invention, the fixed member has a flat plate-like base portion in which a liquid supply flow channel for supplying liquid to the liquid ejecting head is formed. And at least three of the protrusions protrude from one side of the base portion facing the holding frame.

  According to this configuration, since at least three protrusions protrude from the one surface side of the flat plate-like base portion, the flow path forming member is fixed to the holding frame by the tightening force of the screw while suppressing the inclination of the base portion. can do.

  In the screw fixing structure in the liquid jet head holding mechanism of the present invention, the fixed member is provided with a contact portion that contacts the reinforcing member and positions the reinforcing member so as to surround the protruding portion, In the axial direction of the screw, the contact portion is shorter than the projection portion, and the contact portion has higher rigidity than the projection portion.

  According to this configuration, the abutting portion is shorter than the projecting portion and has higher rigidity than the projecting portion. Therefore, even when the projecting portion is crushed and deformed by screwing, the shape is maintained and the reinforcing member is positioned. be able to.

FIG. 2 is a plan view illustrating an embodiment of a liquid ejecting apparatus according to the invention. FIG. 3 is an exploded perspective view of the liquid ejecting head unit as viewed obliquely from above. FIG. 3 is an exploded perspective view of the liquid ejecting head unit as viewed obliquely from below. The top view of a flow-path formation member. The bottom view of a channel formation member. FIG. 4 is a cross-sectional view illustrating a configuration around a screwing portion in a liquid ejecting head unit. Sectional drawing which shows an effect | action when screwing a flow-path unit to a holding | maintenance frame. FIG. 4 is a perspective view of a flow path unit that constitutes the liquid ejecting head unit. The perspective view of the reinforcement member which comprises a flow-path unit.

  Hereinafter, an embodiment in which a liquid ejecting apparatus according to the present invention is embodied in an ink jet printer (hereinafter also abbreviated as “printer”) will be described with reference to the drawings. In the following description, when referring to “front-rear direction”, “left-right direction”, and “up-down direction”, the direction indicated by an arrow in each figure is used as a reference. In addition, in the arrows indicating the upward direction, the right direction, and the forward direction in the drawing, those in which dots are indicated in circles (the view of the tip of the arrow viewed from the front) are arrows pointing from the back of the page to the front. This means that a circle with a cross mark (a view of the arrow blade from behind) means an arrow heading from the front to the back of the page.

  As shown in FIG. 1, in the printer 11 of the present embodiment, on a support member 13 disposed in a frame 12, along a conveyance direction Y that intersects a main scanning direction X that is a longitudinal direction of the frame 12. The paper P is conveyed.

  A plurality of ink cartridges 15 that store ink as an example of liquid are detachably mounted on the cartridge holder 14 disposed on one end side (right end side in FIG. 1) in the longitudinal direction of the frame 12. In the present embodiment, six ink cartridges 15 each containing ink of different colors (for example, black, cyan, magenta, yellow, light cyan, light magenta) are mounted on the cartridge holder 14. Yes.

  Above the cartridge holder 14, a pressure pump 17 that pressurizes and supplies air to each ink cartridge 15 through the air supply tube 16 is placed. Each ink cartridge 15 is connected to an upstream end of a flexible ink supply tube 18.

  A guide shaft 19 extending in the main scanning direction X is installed in the frame 12, and a carriage 20 is slidably supported on the guide shaft 19. The carriage 20 is connected to a carriage motor 22 via a timing belt 21. The carriage 20 is reciprocated in the main scanning direction X along the guide shaft 19 by driving the carriage motor 22.

  A plurality of valve units 23 corresponding to the ink cartridges 15 are mounted on the upper part of the carriage 20, and a liquid ejecting head unit 24 is fixed on the lower part of the carriage 20. Each valve unit 23 is connected to the downstream end of the corresponding ink supply tube 18. The ink pressurized and supplied from the ink cartridge 15 through the ink supply tube 18 by the pressure pump 17 is supplied to the liquid ejecting head unit 24 via the valve unit 23.

  That is, the printer 11 is a so-called off-carriage type printer that supplies ink from the ink cartridge 15 provided on the frame 12 side to the liquid ejecting head unit 24 mounted on the carriage 20. The air supply tube 16, the pressure pump 17, the ink supply tube 18, and the valve unit 23 constitute a liquid supply mechanism that supplies ink to the liquid ejecting head 26.

Next, the liquid jet head unit 24 will be described.
As shown in FIG. 2, the liquid ejecting head unit 24 includes a flow path unit 25 and a holding frame 27 that holds a plurality (six in the present embodiment) of liquid ejecting heads 26 stacked one above the other. 2 It is configured by being screwed by a plurality of (four in this embodiment) screws 28 as an example of the fixture. A positioning hole 29 for positioning the flow path unit 25 in the horizontal direction (main scanning direction X and transport direction Y) is arranged in the main scanning direction X at a position closer to the front side on the upper surface side of the holding frame 27. Two are provided.

  The flow path unit 25 is screwed by a plurality of (six in this embodiment) screws 32 as an example of the first fixture in a state where the flow path forming member 30 and the reinforcing member 31 are stacked one above the other. Consists of. The holding frame 27, the flow path forming member 30, and the reinforcing member 31 constitute a liquid ejecting head holding mechanism that holds the liquid ejecting head 26.

  In the present embodiment, the flow path forming member 30 and the reinforcing member 31 are constituent members that constitute a liquid supply mechanism that supplies ink to the liquid ejecting head 26. The flow path forming member 30 is a fixed member that is fixed to the holding frame 27 by the tightening force of the screws 28.

  The flow path forming member 30 is made of, for example, a resin material such as plastic. The reinforcing member 31 is a sheet metal member formed in a flat plate shape with a metal material having a rigidity higher than that of the flow path forming member 30. Further, the holding frame 27 is made of a metal material such as aluminum.

  The reinforcing member 31 is arranged between the liquid ejecting head 26 and the base portion 42 when the flow path unit 25 is fixed to the holding frame 27. In a state where the flow path forming member 30 is connected to the liquid ejecting head 26, the reinforcing member 31 is grounded via the holding frame 27.

  At the four corners on the upper surface side of the holding frame 27, screwing portions 34 each having a screw hole 33 for screwing the screw 28 are provided. Further, ribs 36 with insertion holes 35 formed from the front end and the left and right ends of the holding frame 27 project. The liquid ejecting head unit 24 is fixed to the lower surface side of the carriage 20 by a fixing tool such as a screw (not shown) inserted into the insertion hole 35 of each rib 36 from below.

  On the upper surface side of the flow path forming member 30, a plurality (six in this embodiment) of supply holes 37 for receiving ink supply from the valve unit 23 are provided along the transport direction Y. Further, two connection holes 38 (38A, 38B) for introducing different color inks are provided on the front side and the rear side on the upper surface side of each liquid ejecting head 26, respectively. Further, an annular seal member 39 is fixed to each connection hole 38 of the liquid jet head 26.

  As shown in FIG. 3, a plurality of nozzles 40 for ejecting ink are provided on the lower surface side of each liquid ejecting head 26. The plurality of nozzles 40 arranged in the transport direction Y constitute a nozzle row 41 that ejects the same color ink. Further, in each liquid ejecting head 26, two nozzle rows 41 (41A, 41B) for ejecting ink of two colors respectively introduced from the connection holes 38 (38A, 38B) are arranged along the main scanning direction X. Are arranged in a line.

  When performing the printing process, in the forward movement of the carriage 20 along the main scanning direction X, ink is sequentially ejected toward the paper P from the nozzle row 41A located on the leading side in the movement direction. Subsequently, after the sheet P is conveyed by a predetermined amount, in the backward movement along the main scanning direction X of the carriage 20, ink is sequentially ejected toward the sheet P from the nozzle row 41 </ b> B located on the leading side in the moving direction. As a result, bidirectional printing in which six colors of ink are overprinted in the same order when the carriage 20 moves forward and when the carriage moves is performed.

Next, the configuration of the flow path forming member 30 will be described in detail.
The flow path forming member 30 has a flat base portion 42 and a plurality of (in this embodiment, twelve) extending in a tubular shape from one surface side (the lower surface side facing the reinforcing member 31) of the base portion 42. And a connecting portion 43. Each connection portion 43 is composed of a pipe pipe that is independently extended so as to be parallel to each other from a position corresponding to the arrangement interval of each liquid jet head 26 in the main scanning direction X. The pipe tube does not have a large flexibility like a flexible tube, and has a rigidity that can maintain its linear shape without being deformed by its own weight even when the posture is changed. A cylindrical tube. In addition, the term “parallel to each other” here refers to not only when all the connecting portions 43 are truly parallel, but also when each connecting portion 43 is a base even when it is inclined at a predetermined angle (for example, about 5 degrees). It is only necessary to extend from one side of the portion 42 in substantially the same direction.

  The connection portions 43 are arranged so that their tips have a positional relationship corresponding to the connection holes 38 provided in the liquid jet heads 26 individually corresponding to the connection portions 43. Specifically, for supplying ink to the connection holes 38 </ b> A (see FIG. 2) provided on the front side of each liquid ejecting head 26 from the front side of the base portion 42 of the flow path forming member 30. Six connection portions 43 are arranged along the main scanning direction X. In addition, from the position behind the base portion 42 of the flow path forming member 30, six nozzles for supplying ink to connection holes 38 </ b> B (see FIG. 2) provided on the rear side of each liquid ejecting head 26. The connecting portion 43 is arranged along the main scanning direction X.

  As shown in FIGS. 4 and 5, the flow path forming region 44 is disposed at a position near the center of the base portion 42 of the flow path forming member 30. Further, a non-flow path forming region 45 is disposed at the end of the base portion 42 so as to surround the flow path forming region 44. In addition, upstream positions of a plurality of liquid supply channels 46 for supplying ink to the respective liquid ejecting heads 26 are formed at positions corresponding to the channel formation regions 44 of the base portion 42.

  As shown in FIG. 5, each connection portion 43 has a first channel 47 that is a downstream channel portion of the liquid supply channel 46 whose upstream end communicates with an upstream channel portion of the liquid supply channel 46. Each is formed.

  Further, on the lower surface side of the base portion 42, six groove-shaped concave portions 48 whose upstream end communicates with the supply hole 37 and whose downstream side branches into two are formed. The downstream end of each recess 48 branched into two communicates with a communication hole 49 that vertically penetrates the flow path forming member 30. Then, the film member 50 is welded so as to cover the six concave portions 48 at positions corresponding to the flow path forming region 44 on the lower surface side of the base portion 42, so that the second flow path 51 is surrounded and formed. Yes.

  As shown in FIG. 4, on the upper surface side of the base portion 42, there is a groove-shaped recess 52 whose upstream end communicates with the communication hole 49 and whose downstream end communicates with the first flow path 47 provided in the connection portion 43. Twelve are formed. Then, the film member 53 is welded so as to cover the twelve concave portions 52 at positions corresponding to the flow path forming region 44 on the upper surface side of the base portion 42, so that the third flow path 54 is surrounded and formed. Yes.

  Then, the ink supplied to the flow path forming member 30 through the supply hole 37 reaches the communication hole 49 through the second flow path 51 as shown by a two-dot chain line arrow in FIG. As indicated by the chain line arrows, the liquid is supplied to the liquid jet head 26 (see FIG. 3) through the third flow path 54 and the first flow path 47. That is, the supply hole 37, the second flow path 51, the communication hole 49, and the third flow path 54 constitute an upstream flow path portion of the liquid supply flow path 46.

  In the non-flow path forming region 45 of the base portion 42, four insertion holes 55 for inserting the screws 28 and six insertion holes 56 for inserting the screws 32 are formed. Each insertion hole 55 is disposed at a position corresponding to approximately four corners of the flow path forming member 30. In addition, each insertion hole 56 forms a flow path so that two pairs arranged along the transport direction Y so as to sandwich the flow path formation region 44 therebetween form a pair, and three pairs line up along the main scanning direction X. It is arranged along the front and rear side edges of the member 30.

  As shown in FIG. 3, from the lower surface side of the base portion 42, a pair of members that position the reinforcing member 31 in the horizontal direction when the reinforcing member 31 is fixed to the flow path forming member 30 to form the flow path unit 25. A first positioning protrusion 57 is provided to protrude. The two first positioning protrusions 57 that form a pair are arranged along the transport direction Y at a position to the right of the base portion 42.

  Similarly, a pair of second positioning projections 58 that project the flow path unit 25 in the horizontal direction when the flow path unit 25 is connected to the holding frame 27 protrude from the lower surface side of the base portion 42. Note that the two second positioning protrusions 58 that form a pair are arranged along the main scanning direction X at a position closer to the front of the base portion 42. Further, the second positioning protrusion 58 has a length in the vertical direction (that is, a protruding amount from the base portion 42) larger than that of the first positioning protrusion 57.

  Similarly, a first annular protrusion 59 as an example of a protrusion formed in an annular shape so as to surround each insertion hole 55 through which the screw 28 is inserted protrudes from the lower surface side of the base portion 42. That is, the four first annular protrusions 59 are provided on the side facing the holding frame 27 in the axial direction Z of the screw 28 in the flow path forming member 30 (up and down direction as the extending direction of the connecting portion 43). Is projected toward the holding frame 27 side. Further, on the outer peripheral side of the first annular protrusion 59, a second annular protrusion 60 as an example of a contact portion formed concentrically with the first annular protrusion 59 is annularly formed so as to surround the first annular protrusion 59. Projected.

  Further, a third annular protrusion 56 a as an example of a contact portion formed in an annular shape so as to surround the insertion hole 56 for inserting the screw 32 protrudes from the lower surface side of the base portion 42. Further, a second annular protrusion 60 that is formed concentrically with the third annular protrusion 56a is provided on the outer peripheral side of the third annular protrusion 56a. The third annular protrusion 56a is equal in length to the second annular protrusion 60 in the axial direction Z.

  The first annular protrusion 59 is longer than the second annular protrusion 60 and shorter than the connecting portion 43 in the axial direction Z. Further, in the radial direction of the screw 28, the second annular protrusion 60 is formed thicker than the first annular protrusion 59, so that the rigidity is higher than that of the first annular protrusion 59.

  Then, when the flow path unit 25 is configured by fixing the reinforcing member 31 to the flow path forming member 30, the second annular protrusion 60 and the third annular protrusion 56a protruding from the lower surface side of the base portion 42 are reinforced. By abutting on the member 31, the reinforcing member 31 is positioned in the axial direction Z. Accordingly, the reinforcing member 31 is fixed to the flow path forming member 30 in a state of being separated from the base portion 42 by the length of the second annular protrusion 60 and the third annular protrusion 56a in the axial direction Z.

  Here, when the reinforcing member 31 is fixed to the flow path forming member 30, the first annular protrusion 59 has a shaft so as to protrude through the reinforcing member 31 and further to the lower side which is the holding frame 27 side. A length in the direction Z is set. That is, as shown in FIG. 6, the first annular protrusion 59 is formed to be longer than the reinforcing member 31 in the axial direction Z. When the flow path unit 25 is screwed to the holding frame 27, the first annular protrusion is generated by the rotational force received from the screw 28 and the reaction force received from the screwing portion 34 of the holding frame 27 when the screw 28 is tightened. 59 is deformed as shown in FIG.

Next, the configuration of the reinforcing member 31 will be described in detail.
As shown in FIG. 8, the front and rear end portions of the reinforcing member 31 are provided with bent portions 31 a whose tips are bent downward. The reinforcing member 31 is provided with an opening 61 in the vicinity of the center corresponding to the flow path forming region 44 provided in the base portion 42 of the flow path forming member 30. The reinforcing member 31 is fixed to the flow path forming member 30 so as to be parallel to the base portion 42 of the flow path forming member 30 and to face the non-flow path forming region 45 of the base portion 42. A flow path unit 25 is configured.

  Four insertion holes 62 through which the screws 28 are inserted are formed at positions substantially at the four corners of the reinforcing member 31. Note that the inner diameter of the insertion hole 62 is larger than the outer diameter of the first annular protrusion 59 projecting from the base portion 42 of the flow path forming member 30. Further, in the reinforcing member 31, three pairs of screw holes 63 for screwing the screws 32 are formed along the main scanning direction X at a position between each bent portion 31 a and the opening 61.

  Two first positioning holes 64 through which the first positioning protrusions 57 of the flow path forming member 30 are inserted are formed along the transport direction Y at a position closer to the right side of the reinforcing member 31 (see FIG. 9). See also). In addition, two second positioning holes 65 for inserting the second positioning protrusions 58 of the flow path forming member 30 are formed along the transport direction Y at a position closer to the front side of the reinforcing member 31.

  Further, the reinforcing member 31 is formed with a plurality of (12 in this embodiment) through-holes 66 for inserting the connection portions 43 of the flow path forming member 30. The inner diameter of the through hole 66 is formed to be slightly larger than the outer diameter of the connection part 43 so that a gap is generated between the connection part 43 and the through hole 66 when the connection part 43 is inserted.

Next, a method for fixing the flow path forming member 30 to the liquid jet head 26 will be described.
First, as an assembling process, an operator arranges the reinforcing member 31 below the flow path forming member 30, and inserts the connection portion 43 of the flow path forming member 30 into the through hole 66 of the reinforcing member 31. The reinforcing member 31 is assembled to the flow path forming member 30 so as to be parallel to 42.

  At this time, the operator inserts the first positioning protrusion 57 and the second positioning protrusion 58 of the flow path forming member 30 into the first positioning hole 64 and the second positioning hole 65 of the reinforcing member 31, respectively. The member 31 is positioned in the horizontal direction. In addition, the operator inserts the first annular protrusion 59 of the flow path forming member 30 into the insertion hole 62 of the reinforcing member 31, and then connects the second annular protrusion 60 and the third annular protrusion 56a of the flow path forming member 30 to the reinforcing member. Positioning the reinforcing member 31 in the axial direction Z is performed by bringing the reinforcing member 31 into contact therewith.

  Next, as a first fixing step, the operator rotates the screw 32 from the upper side of the flow path forming member 30 in a state where the screw 32 is inserted into each insertion hole 56 and the tip thereof is in contact with the screw hole 63 of the reinforcing member 31. Let Then, the operator fixes the reinforcing member 31 with the fastening force of the screw 32 so as to be parallel to the base portion 42 with respect to the flow path forming member 30. Thereby, the flow path unit 25 is constituted by the flow path forming member 30 and the reinforcing member 31 fixed by the screw 32.

  Subsequently, as a connecting step, the operator grasps the bending portion 31a forming a pair of the reinforcing members 31 with both hands, moves the flow path unit 25 in the direction close to the holding frame 27 along the axial direction Z, The connection portions 43 forming a pair of the path forming members 30 are inserted and connected to the two connection holes 38 (38A, 38B) of the corresponding liquid jet heads 26, respectively.

  At this time, the operator positions the flow path unit 25 in the horizontal direction by inserting the second positioning protrusion 58 of the flow path forming member 30 into the positioning hole 29 of the holding frame 27.

  Thereafter, as a second fixing step, the worker fixes the flow path unit 25 to the holding frame 27 with screws 28. Accordingly, the flow path forming member 30 is fixed to the holding frame 27 and the liquid supply flow paths 46 corresponding to the respective liquid ejecting heads 26 are connected to complete the assembly of the liquid ejecting head unit 24. In addition, when the insertion connection with respect to the connection hole 38 of each connection part 43 is completed, the connection part of the connection part 43 and the connection hole 38 will be sealed by the sealing member 39.

Next, operations of the printer 11 and the liquid ejecting head unit 24 according to the present embodiment will be described.
First, in order to reduce the size of the liquid jet head unit 24, it is preferable to reduce the thickness of the base portion 42 of the flow path forming member 30. However, if the base portion 42 is reduced in thickness, deformation such as warpage is likely to occur. In particular, when the base portion 42 is made of a resin material and the film members 50 and 53 are welded to surround the liquid supply channel 46, the base portion 42 is likely to be deformed.

  In that respect, in the liquid jet head unit 24 of the present embodiment, the deformation of the base portion 42 is corrected by assembling the highly rigid reinforcing member 31 by the flow path forming member 30 in the first fixing step. Then, the connecting portion 43 extending from the base portion 42 corrected for deformation in this way is connected to the connection hole 38 of the liquid ejecting head 26, so that it occurs when the flow path forming member 30 in which the base portion 42 is deformed is connected. The positional deviation of the liquid jet head 26 due to a certain pressing force is suppressed.

  In the connecting step, the operator holds the bent portion 31 a forming a pair of the reinforcing members 31 with both hands, and moves the flow path unit 25 in the direction close to the holding frame 27 along the axial direction Z. As a result, the twelve connection portions 43 are inserted and connected to the corresponding connection holes 38, and the plurality of sets of liquid supply flow paths 46 and the liquid ejecting heads 26 are simultaneously connected.

  The liquid ejecting heads 26 are assembled to the holding frame 27 by a fixing tool such as a screw after the arrangement of the liquid ejecting heads 26 is adjusted. There may be a deviation in the arrangement of the connecting portion 43 with respect to the. In that case, the connecting portion 43 is connected to the connecting hole 38 in a state where the connecting portion 43 is slightly bent by the amount of deviation, but between the through hole 66 and the connecting portion 43 of the reinforcing member 31 and the reinforcing member. Since a gap is provided between 31 and the base portion 42, the connecting portion 43 is allowed to bend and deform.

  And since each connection part 43 is extended independently, since rigidity is low rather than the case where it shape | molds integrally in the aspect mutually connected, the connection part 43 bent slightly. Even if a pressing force is exerted on the liquid ejecting head 26 by being connected to the connection hole 38 in a state, the displacement of the liquid ejecting head 26 fixed to the holding frame 27 with a screw or the like is suppressed.

  Further, in the second fixing step, the rotational force of the screw 28 is transmitted to the screwing portion 34 of the holding frame 27, so that the holding frame 27 rotates together with the screw 28 and the position of the liquid ejecting head 26 whose position is adjusted is arranged. There is a risk of shifting. In this respect, in the present embodiment, the first annular protrusion 59 projecting from the base portion 42 of the flow path forming member 30 is deformed to absorb the rotational force of the screw 28, so that the holding frame 27 is rotated. The positional deviation of the accompanying liquid jet head 26 is suppressed.

  Further, when the assembled liquid ejecting head unit 24 is attached to the carriage 20 and a printing process is performed on the paper P, the liquid ejecting head 26 may generate heat due to driving of an element for ejecting ink. When such heat is transmitted to the ink in the liquid supply channel 46 through the holding frame 27 and the reinforcing member 31 made of a metal material, the ink may be deteriorated due to a temperature change.

  In that respect, in the liquid jet head unit 24 of the present embodiment, heat dissipation is promoted by the reinforcing member 31 that is formed in a flat plate shape and has a large surface area. Further, since the base portion 42 of the flow path forming member 30 in which the liquid supply flow path 46 is formed is in contact with the reinforcing member 31 via the third annular protrusion 56 a and the second annular protrusion 60, Heat conduction to the flow path forming member 30 is suppressed. In addition, since the opening 61 is provided at a position corresponding to the flow path forming region 44 of the reinforcing member 31, heat conduction from the reinforcing member 31 to the liquid supply flow path 46 is suppressed.

  When removing the flow path unit 25 from the holding frame 27 for maintenance of the liquid ejecting head 26, the operator holds the bent portion 31a forming the pair of the reinforcing members 31 with both hands, similar to the time of attachment. Thus, the flow path unit 25 can be lifted above the holding frame 27. Then, from the lower surface side of the base portion 42 facing the reinforcing member 31, the direction in which the second annular protrusions 60 become the reinforcing member 31 side so as to form a pair along the front and rear side edge portions of the base portion 42 facing each other. It is projecting toward.

  Therefore, even when the reinforcing member 31 is bent and deformed when the flow path unit 25 is lifted, the deformation of the base portion 42 is suppressed by the paired second annular protrusions 60 coming into contact with the reinforcing member 31. Therefore, even when a resistance is generated when the connecting portion 43 is pulled out from the connecting hole 38 due to the close contact of the seal member 39, the flow path unit 25 can be lifted along the axial direction Z while maintaining the level of the base portion 42. it can. Then, by separating the flow path unit 25 from the holding frame 27 while maintaining the horizontal of the base portion 42, the connection between the plurality of sets of liquid ejecting heads 26 and the liquid supply flow paths 46 is released almost simultaneously.

According to the above embodiment, the following effects can be obtained.
(1) By moving the base part 42 of the flow path forming member 30 in the extending direction (axial direction Z) of the connection part 43, a plurality of tubular parts extended from one surface side (lower surface side) of the base part 42 Can be inserted and connected to connection holes 38 provided in the corresponding liquid jet heads 26. Thereby, the connection work between the plurality of sets of liquid jet heads 26 and the liquid supply flow paths 46 can be completed simultaneously. Therefore, the liquid jet head unit 24 is compared with the case where a plurality of branch flow path forming members made of flexible tubes are connected to the connection holes 38 of the liquid jet head 26 corresponding to each branch flow path forming member. The flow path connection work can be simplified.

  (2) Since each connection part 43 consists of a pipe pipe each extended independently so that it may mutually become parallel, unlike the case where it consists of a flexible tube, each connection part 43 is suppressed, suppressing a big bending deformation. Can be easily inserted into and connected to the corresponding connection holes 38. Incidentally, if the rigidity of the connecting portion 43 is too high, there is a possibility that the arrangement of the liquid ejecting head 26 may be shifted by the pressing force generated at the time of plugging connection when there is a manufacturing error in the liquid ejecting head 26 or the connecting portion 43. is there. In that respect, since each connection part 43 is provided in the independently extended state so that it may mutually become parallel, compared with the case where each connection part 43 is integrally shape | molded in the aspect connected mutually. Low rigidity. For this reason, even when there is an error in the arrangement interval of the liquid ejecting heads 26 and the arrangement of the connection holes 38, the displacement of the liquid ejecting heads 26 can be suppressed by slightly deforming the connection portions 43.

  (3) Since deformation such as warpage accompanying the thinning of the base portion 42 can be corrected by the reinforcing member 31, the flow path in which the base portion 42 is deformed while the base portion 42 is thinned to reduce the size of the apparatus. The positional deviation of the liquid ejecting head 26 due to the pressing force that may occur when the forming member 30 is connected can be suppressed. In addition, when each connection portion 43 is inserted through the through hole 66, a gap is generated between the through hole 66 and the connection portion 43 in the radial direction of the connection portion 43, so that the connection connected to the liquid ejecting head 26 is performed. The bending deformation of the portion 43 is allowed. Therefore, even when there is a manufacturing error or the like in the liquid ejecting head 26 or the connection portion 43, the connection portion 43 is allowed to be slightly bent and deformed when the liquid ejecting head 26 is connected to the connection hole 38. The positional deviation of the head 26 can be suppressed.

  (4) When the reinforcing member 31 is fixed, the third annular protrusion 56 a and the second annular protrusion 60 of the base part 42 abut against the reinforcing member 31, so that the base part 42, the reinforcing member 31, and the connecting part 43 extend in the extending direction. A gap can be provided between the two. Thereby, the bending deformation of the connection portion 43 connected to the liquid jet head 26 is allowed. Therefore, even when there is a manufacturing error or the like in the liquid ejecting head 26 or the connection portion 43, the connection portion 43 is allowed to be slightly bent and deformed when the liquid ejecting head 26 is connected to the connection hole 38. The positional deviation of the head 26 can be suppressed.

  (5) By fixing the reinforcing member 31 to the flow path forming member 30, it is possible to correct deformation such as warpage accompanying the thinning of the base portion 42. In addition, since the reinforcing member 31 is formed of a material having rigidity higher than that of the base portion 42, the reinforcing member 31 is reinforced so as to be parallel to the base portion 42 as compared with a case where the thickness of the base portion 42 is increased to such a degree that deformation can be suppressed. When the member 31 is fixed, the apparatus can be made thinner. Accordingly, the base 42 is thinned to reduce the size of the apparatus, and the displacement of the liquid jet head 26 due to the pressing force that may occur when the flow path forming member 30 with the base 42 deformed is connected is suppressed. can do.

  (6) Since the reinforcing member 31 is disposed between the liquid jet head 26 and the base portion 42, the operator grasps the reinforcing member 31 and attaches / detaches the flow path forming member 30, so that the base accompanying the attachment / detachment is performed. The deformation of the portion 42 can be suppressed.

  (7) Although the base portion 42 may be deformed with the welding of the film members 50 and 53, the deformation of the base portion 42 can be corrected by fixing the reinforcing member 31 to the flow path forming member 30. it can.

  (8) Since the reinforcing member 31 is grounded through the holding frame 27 when being fixed to the holding frame 27, charging is suppressed by suppressing a static electricity discharge path of the reinforcing member 31, and generation of electromagnetic noise is suppressed. Can be. Further, even when the liquid ejecting head 26 generates heat, heat can be radiated from the liquid ejecting head 26 by transmitting heat to the flat reinforcing member 31 through the holding frame 27.

  (9) When the operator holds the reinforcing member 31 with both hands and removes the flow path forming member 30 from the holding frame 27, the third annular protrusion 56a and the second annular protrusion 60 provided on the base portion 42 are the reinforcing member. By abutting 31, the bending deformation of the base portion 42 can be suppressed.

  (10) By fixing the reinforcing member 31 to the flow path forming member 30 with the screws 32, deformation such as warpage of the base portion 42 in the flow path forming member 30 can be corrected by the reinforcing member 31. Then, the flow path forming member 30 in which the deformation of the base portion 42 is corrected in this way is fixed to the holding frame 27 that holds the liquid ejecting head 26 integrally with the reinforcing member 31 by the screw 28, thereby Misalignment can be suppressed. Accordingly, by adopting the flow path forming member 30 having the flat base portion 42 instead of the flexible tube, it is possible to reduce the position of the liquid ejecting head 26 while reducing the size of the apparatus.

  (11) Since the reinforcement member 31 is fixed to the flow path forming member 30, deformation such as warpage of the base portion 42 can be corrected. Therefore, the base portion 42 can be thinned to reduce the size of the apparatus. it can. Further, since the reinforcing member 31 is fixed to the flow path forming member 30 so as to face the non-flow path forming region 45 where the liquid supply flow path 46 is not formed, the heat of the liquid ejecting head 26 and the like is applied to the reinforcing member 31. Even when heat is stored, heat conduction to the flow path forming region 44 can be suppressed. Therefore, heat conduction to the liquid supply channel 46 can be suppressed while downsizing the apparatus.

  (12) Since the non-flow path forming region 45 is disposed at the end of the base portion 42 so as to surround the flow path forming region 44 disposed in the vicinity of the center of the base portion 42, the non-flow path forming region 45 is reinforced. By fixing the member 31, the deformation of the base portion 42 can be corrected more evenly. Further, since the reinforcing member 31 has the opening 61 at a position corresponding to the flow path forming region 44, the flow channel forming region 44 and the reinforcing member 31 are separated from each other to suppress heat conduction to the liquid supply flow channel 46. Can do. Furthermore, by providing the opening 61 near the center of the reinforcing member 31, the shape of the reinforcing member 31 can be simplified and the weight of the reinforcing member 31 can be reduced.

  (13) Since the reinforcing member 31 is disposed between the holding frame 27 and the base portion 42, when the liquid jet head 26 generates heat, the reinforcing member 31 and the holding frame 27 having high thermal conductivity radiate heat. Can be promoted.

  (14) When the reinforcing member 31 is fixed to the flow path forming member 30, the third annular protrusion 56 a and the second annular protrusion 60 projecting from the base portion 42 of the flow path forming member 30 come into contact with the reinforcing member 31 to reinforce the reinforcing member. Since the positioning of 31 is performed, the contact area between the reinforcing member 31 and the base portion 42 can be reduced, and heat conduction from the reinforcing member 31 to the flow path forming member 30 can be suppressed.

  (15) Since the first annular protrusion 59 is crushed and deformed when the screw 28 is tightened, the transmission of the rotational force to the holding frame 27 via the flow path forming member 30 is suppressed, so that the displacement of the holding frame 27 is suppressed. Meanwhile, the flow path forming member 30 can be fixed. Therefore, when the flow path forming member 30 is fixed to the holding frame 27 that holds the liquid ejecting head 26 by the tightening force of the screw 28, the positional deviation of the liquid ejecting head 26 can be suppressed.

  (16) Since the first annular protrusion 59 is formed in an annular shape so as to surround the insertion hole 55, transmission of rotational force to the holding frame 27 in the rotational direction of the screw 28 can be evenly suppressed.

  (17) Since three or more first annular protrusions 59 project from the one surface side of the flat base portion 42, the flow path forming member 30 is screwed onto the holding frame 27 while the inclination of the base portion 42 is suppressed. It can be fixed by the tightening force.

  (18) Since the first annular protrusion 59 is longer than the reinforcing member 31 in the axial direction Z of the screw 28, the first annular protrusion 59 is also provided when the reinforcing member 31 is disposed between the flow path forming member 30 and the holding frame 27. The annular protrusion 59 can be brought into contact with the holding frame 27 side.

  (19) Since the second annular protrusion 60 is shorter than the first annular protrusion 59 and has a higher rigidity than the first annular protrusion 59, it retains its shape even when the first annular protrusion 59 is crushed and deformed by screwing. Thus, the reinforcing member 31 can be positioned.

In addition, you may change the said embodiment as follows.
The liquid jet head unit 24 may not include the reinforcing member 31.
A configuration in which the liquid supply flow path 46 and the liquid jet head 26 are connected by inserting and connecting a connection portion extending from the liquid jet head 26 side to a connection hole provided in the flow path forming member 30. There may be.

-For example, it is good also as a structure by which the flow-path formation member 30 and the reinforcement member 31 are fixed by fixing tools other than a screw, such as a clip.
The engaging member 31 protruding from one side of the flow path forming member 30 and the reinforcing member 31 is engaged with the engaged part provided on the other side, so that the reinforcing member 31 is the flow path forming member. 30 may be fixed.

The flow path forming member 30 may not be provided with the second annular protrusion 60 and the third annular protrusion 56a.
The plurality of connection portions 43 of the flow path forming member 30 are different in length from each other, or some or all of the connection portions 43 are bent at intermediate positions, so that there are portions that are not parallel to each other. Good. Also in this case, if the tips of the connection portions 43 are parallel to each other so as to correspond to the connection holes 38, a plurality of connection portions 43 are simultaneously inserted into the corresponding connection holes 38, respectively. Can be connected.

The reinforcing member 31 may be configured not to include the opening 61 or may be configured to include a plurality of openings 61.
The flow path forming member 30 may be made of a material other than a resin material, and the reinforcing member 31 and the holding frame 27 may be made of a material other than a metal material.

  The number and arrangement of the first annular protrusion 59, the second annular protrusion 60, and the third annular protrusion 56a can be arbitrarily changed. For example, the second annular protrusion 60 may be disposed not on the outer peripheral side of the first annular protrusion 59 or the third annular protrusion 56a but on the side edge of the base portion 42 in the flow path forming member 30 or the like. Further, the first annular protrusion 59, the second annular protrusion 60, and the third annular protrusion 56a may be changed to protrusions having any shape that is not annular.

  The base portion 42 of the flow path forming member 30 may be disposed between the holding frame 27 and the reinforcing member 31. According to this configuration, since the base portion 42 made of a resin material is disposed between the holding frame 27 and the reinforcing member 31, the heat of the liquid jet head 26 is transferred to the reinforcing member 31 via the metal holding frame 27. It is possible to suppress transmission.

The first annular protrusion 59 that is crushed and deformed by the rotational force received from the screw 28 may protrude from the screwing portion 34 side of the holding frame 27.
The number and arrangement of the connection holes 38 provided in each liquid ejecting head 26 can be arbitrarily changed.

  The printer may be an on-carriage type in which the ink cartridge 15 is mounted on the carriage 20. Alternatively, not only a serial type printer in which the carriage 20 moves in the main scanning direction X, but also a line head type or a lateral type printer capable of printing in the maximum paper width range while the liquid ejecting head 26 is fixed. Good. Furthermore, an ink jet type label printer, a barcode printer, a ticket issuing device, or the like may be used.

  The liquid ejecting apparatus is not limited to a printer, but may be a FAX apparatus, a copying apparatus, or a multifunction machine having a plurality of these functions. Furthermore, a liquid ejecting apparatus that ejects or ejects liquid other than ink may be employed, and can be used for various liquid ejecting apparatuses including a liquid ejecting head that ejects a minute amount of liquid droplets. . In addition, a droplet means the state of the liquid discharged from the said liquid ejecting apparatus, and shall also include what pulls a tail in granular shape, tear shape, and thread shape. The liquid here may be any material that can be ejected by the liquid ejecting apparatus. For example, it may be in the state when the substance is in a liquid phase, such as a liquid state with high or low viscosity, sol, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals (metal melts ) And a liquid as one state of a substance, as well as a material in which particles of a functional material made of a solid such as a pigment or metal particles are dissolved, dispersed or mixed in a solvent. Further, representative examples of the liquid include ink and liquid crystal as described in the above embodiment. Here, the ink includes general water-based inks and oil-based inks, and various liquid compositions such as gel inks and hot melt inks. As a specific example of the liquid ejecting apparatus, for example, a liquid containing a material such as an electrode material or a color material used for manufacturing a liquid crystal display, an EL (electroluminescence) display, a surface emitting display, a color filter, or the like in a dispersed or dissolved state. It may be a liquid ejecting apparatus for ejecting. Further, it may be a liquid ejecting apparatus that ejects a bio-organic matter used for biochip manufacture, a liquid ejecting apparatus that ejects a liquid as a sample that is used as a precision pipette, a printing apparatus, a micro dispenser, or the like. In addition, transparent resin liquids such as UV curable resin to form liquid injection devices that pinpoint lubricant oil onto precision machines such as watches and cameras, and micro hemispherical lenses (optical lenses) used in optical communication elements. A liquid ejecting apparatus that ejects a liquid onto the substrate or a liquid ejecting apparatus that ejects an etching solution such as an acid or an alkali to etch the substrate may be employed.

  DESCRIPTION OF SYMBOLS 11 ... Printer as an example of liquid ejecting apparatus, 24 ... Liquid ejecting head unit, 25 ... Flow path unit, 26 ... Liquid ejecting head, 27 ... Holding frame, 28 ... Screw as an example of 2nd fixing tool, 30 ... Cover A flow path forming member as an example of a fixing member, 31 ... a reinforcing member, 32 ... a screw as an example of a first fixture, 38, 38A, 38B ... a connection hole, 42 ... a base portion, 43 ... a connection portion, 44 ... a flow Channel forming region, 45 ... Non-channel forming region, 46 ... Liquid supply channel, 48,52 ... concave, 50,53 ... film member, 55 ... insertion hole, 56a ... annular protrusion as an example of contact portion, 59 A first annular protrusion as an example of the protrusion, 60 a second annular protrusion as an example of the abutting part, 61 an opening, 66 a through-hole, Z an axial direction that is an extending direction.

Claims (4)

One of the holding frame that holds the liquid ejecting head and the fixed member that is fixed to the holding frame by the tightening force of the screw projects toward the other side of the screw in the axial direction. A projecting portion that is crushed and deformed by a rotational force received from the screw and a reaction force received from the other side when the screw is tightened ,
A flat reinforcing member is disposed between the fixed member and the holding frame,
The screw fixing structure in the liquid ejecting head holding mechanism , wherein the protrusion is longer than the reinforcing member in the axial direction of the screw.   The fixed member is provided with an insertion hole for inserting the screw, and the protruding portion surrounds the insertion hole on the side of the fixed member facing the holding frame in the axial direction of the screw. The screw fixing structure in the liquid jet head holding mechanism according to claim 1, wherein the screw fixing structure is formed in an annular shape. The fixed member is a flow path forming member having a plate-like base portion in which a liquid supply flow path for supplying a liquid to the liquid ejecting head is formed.
3. The screw fixing structure in the liquid ejecting head holding mechanism according to claim 1, wherein at least three of the protrusions protrude from one surface side of the base portion facing the holding frame.   A contact portion that contacts the reinforcing member and positions the reinforcing member is provided on the fixed member so as to surround the protrusion.
  The contact part is shorter than the projection part in the axial direction of the screw, and the contact part is higher in rigidity than the projection part. A screw fixing structure in the liquid ejecting head holding mechanism according to the item.

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