JP5139115B2 - Ejection recovery device, image forming apparatus - Google Patents

Description

  The present invention relates to an ejection recovery device, and more particularly to an ejection recovery device that cleans an ink ejection unit that ejects ink. The present invention also relates to an image forming apparatus having a discharge recovery device.

  An image forming apparatus employing an inkjet head mainly includes an image forming unit and a paper transport unit that transports paper to the image forming unit. The image forming unit has a plurality of ink jet heads, and each ink jet head has an ink discharge port.

  In such an image forming apparatus, the sheet is conveyed by the sheet conveying unit below the image forming unit. Then, based on the image information, ink is ejected from the ink discharge port of the inkjet head onto the paper, and an image is formed on the paper surface. Then, the paper on which the image is formed is transported to the discharge unit by the paper transport unit.

  On the other hand, in the image forming apparatus, when the image forming operation is completed and the standby state continues for a long time, the ink in the ink discharge port is dried and the vicinity of the ink discharge port is clogged, or dust adheres around the ink discharge port. There is a risk of falling. For this reason, when the image forming apparatus is in a standby state, the ink discharge port may be protected by a cap, for example.

In particular, in order to prevent the ink at the ink discharge port from drying and clogging the vicinity of the ink discharge port, and to prevent the ink viscosity from becoming high due to drying and hindering normal ink discharge, A discharge recovery operation for maintaining the discharge of ink from the outlet in a normal state is executed in the image forming apparatus. In this discharge recovery operation, first, ink is discharged from the ink discharge port. Specifically, in the ejection recovery operation, ink is pushed out from the nozzles by applying pressure to the nozzles using a pump for about 1 second. Subsequently, after ink is ejected, the ink ejection surface is wiped with a wiper. In this way, clogging in the vicinity of the ink discharge port is eliminated, and the ink discharge surface is cleaned (see Patent Document 1). Note that the ejection recovery operation is performed not only when the ink ejection port is clogged but also when the image forming apparatus is activated or when printing is started.
JP 2007-253592 A

  In the conventional image forming apparatus, when the ejection recovery operation is executed, ink is ejected from the ink ejection port of the inkjet head, and the ink remaining on the ink ejection surface is wiped off by the wiper.

  Generally, the amount of ink ejected from the ink ejection port during the ejection recovery operation is larger than the amount of ink ejected from the ink ejection port during printing. For this reason, when the ejection recovery operation is executed, the ejected ink may remain on the ink ejection surface. In order to solve such a problem, as described above, the ink remaining on the ink ejection surface is wiped off by the wiper.

  For example, in a line recording type image forming apparatus, the ink remaining on the ink ejection surface is wiped off by the wiper by scanning the wiper in the longitudinal direction of the inkjet head. In general, the length that the wiper scans (wiper scanning length) is equal to or longer than the length of the inkjet head, for example, 1/3 or more of the A4 width or 1/3 or more of the A3 width. When trying to scan the wiper over such a long wiper scanning length, a gap may be formed between the wiper and the ink ejection surface depending on the situation, and ink may remain on the ink ejection surface. There was a point.

  An object of the present invention is to provide a discharge recovery device in which a cleaning member can stably scan an ink discharge portion. Another object of the present invention is to provide an image forming apparatus in which a cleaning member can stably scan an ink discharge portion.

The discharge recovery device according to the present invention is a discharge recovery device that cleans an ink discharge portion that discharges ink. The discharge recovery device includes a discharge recovery unit and a moving mechanism. The ejection recovery unit includes a cleaning member that cleans the ink ejection unit, and a positioning member that positions the cleaning member with respect to the ink ejection unit. The movement mechanism moves the ejection recovery unit relative to the ink ejection unit in a state where the positioning member is brought into contact with the ink ejection unit and the cleaning member is positioned with respect to the ink ejection unit.

  In this ejection recovery device, the positioning member of the ejection recovery unit is brought into contact with the ink ejection unit. Then, the cleaning member is positioned with respect to the ink ejection unit. In this state, the ejection recovery unit is moved relative to the ink ejection unit by the moving mechanism. Thereby, the ink adhering to the ink discharge portion is removed by the cleaning member, and the ink discharge portion is cleaned.

  Thus, in this discharge recovery device, the cleaning member can be positioned on the ink discharge portion by bringing the positioning member of the discharge recovery portion into contact with the ink discharge portion. In this state, by moving the discharge recovery portion relative to the ink discharge portion by the moving mechanism, the ink discharge portion can be stably scanned by the cleaning member. That is, the ink discharge part can be reliably cleaned by the cleaning member.

In the discharge recovery device according to the present invention, ejection exits the recovery unit, a biasing member for biasing said cleaning member and said positioning member to said ink ejecting portion has more.

  In this case, the cleaning member and the positioning member can be urged toward the ink discharge portion by the urging member. For this reason, the positioning member can be reliably brought into contact with the ink discharge portion. In addition, the cleaning member can be reliably positioned on the ink discharge portion. Thereby, when the ejection recovery unit is moved relative to the ink ejection unit by the moving mechanism, the ink ejection unit can be stably scanned by the cleaning member. That is, the ink discharge part can be reliably cleaned by the cleaning member.

In the discharge recovery device according to the present invention, i ink ejection portion has an ink head stepped portion is formed, and a body member for the ink head ink head is mounted. The cleaning member is positioned on the ink head by bringing the positioning member of the ejection recovery portion into contact with the step portion of the ink head.

  In this case, the cleaning member can be positioned on the ink head by bringing the positioning member of the ejection recovery portion into contact with the step portion of the ink head. Accordingly, even when the ejection recovery unit moves relative to the ink head by the moving mechanism in a state where the ink is attached to the ink head, it is possible to prevent the ink of the ink head from adhering to the positioning member. That is, it is possible to prevent the positioning member from being soiled by the ink attached to the ink head.

In the discharge recovery device according to the present invention, i ink discharge portion, and a body member for the ink head and the ink heads. Here, the ink head is mounted on the main body member for the ink head so that the head surface of the ink head and the main body member for the ink head have a predetermined step. Then, the cleaning member is positioned on the ink head by bringing the positioning member of the ejection recovery portion into contact with the main body member for the ink head.

  In this case, the cleaning member can be positioned on the ink head by bringing the positioning member of the ejection recovery portion into contact with the main body member for the ink head having a step between the head surface of the ink head. Accordingly, even when the ejection recovery unit moves relative to the ink head by the moving mechanism in a state where the ink is attached to the ink head, it is possible to prevent the ink of the ink head from adhering to the positioning member. That is, it is possible to prevent the positioning member from being soiled by the ink attached to the ink head.

In the discharge recovery device according to the present invention, ejection exits the recovery unit, a body member for cleaning member cleaning member is mounted, has further. Here, the positioning member is a rotating member that is rotatably mounted on the main body member for the cleaning member.

  In this case, the positioning member is a rotating member that is rotatably attached to the main body member for the cleaning member. For example, the cleaning member can be positioned on the ink discharge portion by bringing the positioning member into contact with the ink discharge portion. In this state, when the ejection recovery unit is moved relative to the ink ejection unit by the moving mechanism, the ink ejection unit can be more stably scanned by the cleaning member while the positioning member rotates. That is, the ink discharge part can be more reliably cleaned by the cleaning member.

The image forming apparatus according to the present invention, the transport and the ejection recovery device, an image forming section for forming an image on a recording medium based on the image information having an ink discharge portion, the recording medium at a position facing the ink discharge portion And a recording medium transport unit.

  In the discharge recovery device according to the present invention, the cleaning member can be positioned on the ink discharge portion by bringing the positioning member of the discharge recovery portion into contact with the ink discharge portion. In this state, by moving the discharge recovery portion relative to the ink discharge portion by the moving mechanism, the ink discharge portion can be stably scanned by the cleaning member. That is, the ink discharge part can be reliably cleaned by the cleaning member.

<Overall configuration>
FIG. 1 shows a schematic configuration of an image forming apparatus 1 as a first embodiment of the present invention. The image forming apparatus 1 shown here is an ink jet printer that can form an image on a sheet, which is an example of a recording medium, based on image information transmitted from an external computer. Such an image forming apparatus 1 includes an image forming unit 2, a paper storage unit 3, a paper transport unit 4, a transport unit moving mechanism 5, a discharge recovery device 67, a paper holding mechanism 8, and a discharge unit 9. (Refer to FIG. 2 for the discharge recovery device 67).

  The image forming unit 2 is a part that forms an image on a sheet based on image information. The image forming unit 2 includes a plurality of ink discharge units 20.

  The ink ejection unit 20 includes an inkjet head 21 and a main body member 24 for the inkjet head (see FIG. 8). The inkjet head 21 has an ink ejection surface 22 that ejects ink and two step surfaces 23 (see FIG. 8) that have a step between the ink ejection surface 22. The step surfaces 23 are formed in L-shaped notches provided on both sides of the ink discharge surface 22 in the short direction. The two step surfaces 23 are formed in parallel to each other in the longitudinal direction of the ink ejection surface 22.

  The plurality of inkjet heads 21 are mounted on a main body member 24 for the inkjet head. The plurality of inkjet heads 21 are arranged side by side above a conveyance belt 41d of a conveyance unit 4A, which will be described later, and are portions that eject ink onto paper based on image information from an upper device (not shown). The inkjet head 21 used here is a line-type head capable of forming an image by ejecting ink in a direction perpendicular to the paper transport direction.

  Here, for example, four sets of inkjet heads (12 inkjet heads) 21 are arranged side by side above the conveyance belt 41d of the conveyance unit 4A. The four sets of inkjet heads 21 store inks of different colors for each set. A plurality of holes (not shown) for ejecting ink are provided on the ink ejection surface 22 of each of the four sets of inkjet heads 21. In FIG. 1, only one of the ink ejection surfaces 22 is given a reference numeral and the others are omitted. The ink discharge surface 22 is provided on the lower surface of the inkjet head 21. The ink discharge surface 22 is formed in a rectangular shape that is long in a direction orthogonal to the paper transport direction. By ejecting ink from the ink ejection surface 22, an image is formed on the paper.

  Here, the definition of the wording indicating the direction used in the present embodiment is shown. In the following, the term “front-rear direction” may be used. This wording is a wording indicating a direction perpendicular to the paper surface in FIG. 1 (corresponding to a direction orthogonal to the paper conveyance direction). In the following, the term “front (front side)” and the term “rear (rear side)” may be used. The term “front (front side)” is a term indicating the front side in a direction perpendicular to the paper surface of FIG. 1. The term “rear (rear side)” is a term indicating the back side in a direction perpendicular to the paper surface of FIG. 1. Furthermore, in the following, the term “left-right direction” and the term “up-down direction” may be used. The term “left / right direction” is a term indicating the left / right direction (corresponding to the paper transport direction) in FIG. 1. The term “vertical direction” means the vertical direction in FIG.

  The sheet storage unit 3 is a portion that can store a sheet on which an image is formed, and is disposed at the lower part of the image forming apparatus 1. In addition, the paper storage unit 3 includes a paper feed cassette 31 that stores paper and a paper supply roller 32 for supplying paper to the transport unit 4A.

  The paper transport unit 4 is a part that transports the paper from the paper storage unit 3 to the discharge unit 9. The paper transport unit 4 transports the paper again after temporarily stopping a plurality of rollers 33 that transport the paper and correcting the skew. It mainly includes a registration roller pair 34 that feeds out to the unit 4A and a transport unit 4A. The transport unit 4 </ b> A is disposed below the image forming unit 2 so as to face the image forming unit 2. The transport unit 4 </ b> A transports the paper on which the image is formed on the surface by the image forming unit 2 to the discharge unit 9. Specifically, the transport unit 4 </ b> A is disposed below the ink ejection surface 22 so as to face the ink ejection surface 22 of the image forming unit 2. The transport unit 4 </ b> A transports the paper to a position facing the ink ejection surface 22, and transports the paper to the discharge unit 9 when an image is formed on the paper.

  When the sheet is conveyed by the registration roller 34, the leading end of the sheet is detected by an optical sheet leading end detection sensor 35 disposed on the right side of the inkjet head 21. Then, ink is ejected from the inkjet head 21 to form an image on the basis of the time when the leading edge of the sheet is detected by the sheet leading edge detection sensor 35.

  The transport unit 4A includes a frame body 41a, rollers 41b and 41c, and a transport belt 41d. The frame main body 41 a is disposed below the inkjet head 21. The rollers 41b and 41c are rotatably mounted on the frame body 41a with a predetermined interval in the paper transport direction. The conveyor belt 41d is an endless belt, and is stretched over the rollers 41b and 41c. The transport belt 41d is provided with a plurality of holes through which air can pass. These holes have a diameter of about 4 mm, for example, and are uniformly provided on the conveyor belt 41d with an interval of about 20 mm. A hole (air passage hole) similar to the hole provided in the conveyance belt 41d is also provided on the upper surface of the frame body 41a that supports the conveyance belt 41d via the rollers 41b and 41c.

  Here, the upper surface of the transport belt 41 d is defined as the transport surface 47. The transport surface 47 faces the ink discharge surface 22 below the ink discharge surfaces 22 of the plurality of inkjet heads 21.

  The transport unit moving mechanism 5 is a device for moving the transport unit 4 </ b> A in the vertical direction to bring the transport surface 47 close to the ink discharge surface 22 or to separate the transport surface 47 from the ink discharge surface 22. . The transport unit moving mechanism 5 is disposed below the transport unit 4A. By the transport unit moving mechanism 5, the transport unit 4 </ b> A is moved in a direction close to the ink discharge surface 22 and a direction away from the ink discharge surface 22.

  The transport unit moving mechanism 5 has a pair of eccentric cams 5a and 5b for moving the transport unit 4A. Of the pair of eccentric cams 5a and 5b, the eccentric cam 5a (hereinafter referred to as "first eccentric cam") located on the left side in FIG. 1 is provided to be rotatable around a shaft portion, and is not shown in the figure. It is rotationally driven by. The first eccentric cam 5a is provided with a plurality of bearings 51a, and the first eccentric cam 5a supports the frame main body 41a of the transport unit 4A via the bearings 51a.

  The eccentric cam 5b (hereinafter referred to as “second eccentric cam”) located on the right side in FIG. 1 has the same structure as the first eccentric cam 5a, and has a mirror image relationship with the first eccentric cam 5a in FIG. It is arranged to be. The second eccentric cam 5b is provided with a plurality of bearings 51b, and the second eccentric cam 5b supports the frame body 41a of the transport unit 4A via the bearings 51b. FIG. 1 shows a state in which the transport unit 4A is raised. When the pair of eccentric cams 5a and 5b rotate inward from each other in this state, the transport unit 4A descends (see FIG. 3).

  When the image forming unit 2 forms an image on a sheet, the transport unit moving mechanism 5 raises the transport unit 4A and moves it to the position shown in FIG. 1 (image forming position, proximity position). In a state where the transport unit 4A is positioned at the image forming position, the gap between the ink ejection surface 22 of the inkjet head 21 and the paper is set to an optimum gap for printing, for example, about 1.0 mm. On the other hand, when the transport unit moving mechanism 5 protects the ink discharge surface 22 of the inkjet head 21 by the cap member 61 when the operation is stopped, or when processing a paper jam occurring on the transport belt 41d, the transport unit 4A is lowered and moved to the position (separation position) shown in FIG.

  The ejection recovery device 67 is a device for cleaning the ink ejection surface 22 that ejects ink. The ejection recovery device 67 is also a device for keeping the ink ejection surface 22 that ejects ink clean by protecting the ink ejection surface 22 from dust and drying. Such a discharge recovery device 67 includes a discharge recovery unit 6 and a recovery unit moving mechanism 7 as shown in FIG.

  The discharge recovery unit 6 includes a first discharge recovery unit 260, a second discharge recovery unit 60, and a support member 62 that supports the first discharge recovery unit 260 and the second discharge recovery unit 60.

  The support member 62 includes a plurality of wiper mounting members 262 (main body member for cleaning member: see FIG. 8) of the first discharge recovery portion 260 and a plurality of cap members 61 (see FIG. 8) described later. 5). As shown in FIGS. 2 and 3, the support member 62 includes a support portion 62a that supports the eight wiper mounting members 262 and the twelve cap members 61, and a pair of opposing portions on both sides of the support portion 62a. It has the wall part 62b and a pair of flange part 62c extended outward from a pair of wall part 62b.

  The support part 62a has a two-layer structure, and includes a first support part 162a (a support part positioned upward in FIG. 3) and a second support part 162b (a support part positioned downward in FIG. 3). Yes. The first support portion 162a is supported by the second support portion 162b above the second support portion 162b. Specifically, the first support part 162a and the second support part 162b are formed in a rectangular plate shape. The first support portion 162a is supported by the second support portion 162b via a spacing member 65 provided on the second support portion 162b above the second support portion 162b. The first support portion 162a is formed with a through hole 262a for mounting the cap member 61 (see FIG. 5).

  The pair of wall portions 62b are formed integrally with the second support portion 162b at both ends of the second support portion 162b. Further, a rotating member for a support member, for example, a roller member 64 for a support member is rotatably mounted on each of the pair of wall portions 62b (see FIGS. 2, 6, and 7). Here, the two roller members 64 for the support members are rotatably mounted on the respective wall portions 62b with a predetermined interval. The pair of flange portions 62c are engaged with the recovery portion moving mechanism 7 (see FIGS. 2, 4, 6, and 7).

  As shown in FIG. 8, the first discharge recovery portion 260 includes a wiper mounting member 262 (wiper main body member), a wiper 261 that is a cleaning member, and a roller member 263 that is a positioning member. ing.

  The wiper mounting member 262 includes a first mounting member 362, a second mounting member 462, and an urging member 562. The first mounting member 362 is mounted on the support portion 62a (162a) of the support member 62. The first mounting member 362 is provided with a mounting portion for mounting the second mounting member 462, for example, two mounting holes 362a.

  The second mounting member 462 is mounted on the first mounting member 362. For example, the second mounting member 462 has a concave portion 462a formed in a concave shape, and two protruding portions 462b provided to protrude outward from the lower surface of the concave portion 462a. A biasing member 562, for example, a wiper spring member 562 is fitted and attached to each of the two protrusions 462b. The two protrusions 462b are inserted through the two mounting holes 362a of the first mounting member 362. And the front-end | tip part of the protrusion part 462b penetrated by the mounting hole 362a of the 1st mounting member 362 is stopped by the locking member, for example, E ring. In this way, the second mounting member 462 is mounted on the first mounting member 362.

  The wiper spring member 562 used here is a member for urging the wiper 261 and the wiper roller member 263 toward the ink discharge unit 20. For example, the wiper spring member 562 is disposed between the first mounting member 362 and the second mounting member 462. The wiper spring member 562 causes the wiper 261 to be attached to the second attachment member 462 and the wiper roller member 263 when the wiper roller member 263 contacts the inkjet head 21 to the inkjet head 21. It plays a role of energizing towards.

  The wiper 261 is a member for removing the ink attached to the ink discharge surface 22 and cleaning the ink discharge surface 22. The wiper 261 has a plate-like wiper main body 261a and a base end 261b that supports one end of the wiper main body 261a. The wiper body 261a is formed using an elastic member such as EPDM. The base end portion 261 b of the wiper is attached to the second attachment member 462 of the wiper attachment member 262. Here, the base end portion 261 b of the wiper is mounted on the bottom of the recess 462 a of the second mounting member 462.

  Here, the length from the bottom of the recess 462a to the tip of the wiper 261 (the tip of the wiper main body 261a) when the wiper roller 263 is not in contact with the inkjet head 21 is the wiper roller 263. The wiper 261 is configured so as to be longer than the distance from the bottom of the recess 462a to the ink ejection surface 22 in a state where the ink contacts the inkjet head 21.

  In other words, after the wiper main body 261 a is bent by the wiper roller member 263 coming into contact with the inkjet head 21, before the wiper main body 261 a is bent with respect to the distance from the bottom of the recess 462 a to the ink discharge surface 22. The wiper 261 is configured such that the ratio h of the length from the bottom of the recess 462a to the tip of the wiper body 261a is greater than 1.0.

  For example, when the length from the bottom of the recess 462a to the tip of the wiper body 261a before the wiper body 261a is bent is represented by the symbol “Lp (mm)”, the recess 462a after the wiper body 261a is bent. Here, the distance from the bottom of the ink to the ink ejection surface 22 is set to “Lp−0.5 (mm)”. Thus, the above ratio can be expressed as “h = Lp / (Lp−0.5)”. This also indicates that the amount of protrusion of the wiper 261 with respect to the ink ejection surface 22 is set to about 0.5 mm.

  The wiper roller member 263 is a member for positioning the wiper 261 with respect to the inkjet head 21. The wiper roller member 263 is formed in a disk shape. The roller member 263 for the wiper can come into contact with the inkjet head 21. For example, the outer periphery of the wiper roller member 263 can come into contact with the stepped surface 23 of the inkjet head 21. The wiper roller 263 is brought into contact with the step surface 23 of the inkjet head 21, whereby the wiper 261 is positioned with respect to the ink ejection surface 22 of the inkjet head 21. In this state, the ejection recovery unit 6 is moved relative to the ink ejection unit 20 by the recovery unit moving mechanism 7. The wiper roller member 263 is rotatably mounted on the second mounting member 462 of the wiper mounting member 262. Here, the roller member 263 for the wiper is mounted on the inner wall surfaces facing each other in the recess 462a of the second mounting member 462.

  As shown in FIGS. 2 to 3 and 5, the second ejection recovery section 60 separates the cap member 61 for protecting the ink ejection surface 22 of the image forming section 2 and the cap member 61 from the support member 62. A spring member 63 biasing in the direction and a locking member 68 for locking the cap member 61 to the support member 62 are provided.

  The cap member 61 is a member for protecting the ink discharge surface 22 by covering the ink discharge surface 22. The cap member 61 includes a plate portion 61a, a side wall portion 61b, and a shaft portion 61c. The plate portion 61 a is a portion facing the ink ejection surface 22 and is formed in a rectangular plate shape corresponding to the shape of the ink ejection surface 22. The side wall portion 61b is erected on the upper surface of the plate portion 61a, that is, the surface facing the ink ejection surface 22. Specifically, the side wall part 61b is erected along the outer periphery of the plate part 61a. The side wall portion 61b is provided over the entire circumference of the plate portion 61a so that the plate portion 61a does not contact the ink discharge hole of the ink discharge surface 22. The shaft portion 61c is provided so as to protrude outward from the surface of the plate portion 61a opposite to the surface on which the side wall portion 61b is formed. Specifically, it protrudes outward from the lower surface of the plate portion 61a.

  As shown in FIG. 5, the spring member 63 is disposed between the cap member 61 and the support member 62 (162a). Here, one end of the spring member 63 contacts the upper surface of the support member 62, and the other end of the spring member 63 contacts the lower surface of the cap member 61. Specifically, one end of the spring member 63 abuts on the first surface of the first support portion 162a (hereinafter referred to as “the upper surface of the first support portion”), and the other end of the spring member 63 is the plate portion 61a. In contact with the surface opposite to the surface on which the side wall portion 61b is formed (hereinafter referred to as “the lower surface of the plate portion”). In this way, the spring member 63 is sandwiched between the cap member 61 and the support member 62.

  As shown in FIG. 5, the locking member 68 is a retaining member for preventing the cap member 61 from coming out of the support member 62. The locking member 68 is attached to the distal end portion of the shaft portion 61 c of the cap member 61. Here, for example, an E-ring is used as the retaining member, that is, the locking member 68. The locking member 68 has a diameter larger than the diameter of the through hole 262 a of the support member 62. For this reason, when the locking member 68 is attached to the distal end portion of the shaft portion 61c of the cap member 61, the shaft portion 61c can be prevented from coming off from the through hole 262a of the support member 62.

  In such a second discharge recovery portion 60, first, one end of the spring member 63 is positioned on the upper surface of the first support portion 162a so that the center of the spring member 63 and the center of the through hole 262a of the first support portion 162a coincide. It is made to contact. Next, the shaft portion 61 c of the cap member 61 is inserted into the spring member 63 from the other end side of the spring member 63. Subsequently, the lower surface of the plate portion 61 a is brought into contact with the other end of the spring member 63. Then, in a state where the spring member 63 is compressed between the upper surface of the first support portion 162a and the lower surface of the plate portion 61a of the cap member 61, the distal end portion of the shaft portion 61c of the cap member 61 is the first support portion 162a. Is fitted into the through hole 262a. Then, the tip end portion of the shaft portion 61c of the cap member 61 passes through the through hole 262a of the first support portion 162a, and the second surface (hereinafter referred to as “first” It protrudes outward from the lower surface of the support part. Next, the locking member 68 is attached to the distal end portion of the shaft portion 61 c of the cap member 61 on the lower surface side of the first support portion 162 a. Thereby, the cap member 61 is attached to the support member 62.

  The recovery unit moving mechanism 7 defines the discharge recovery unit 6 by a direction (A direction and a direction opposite to the A direction) orthogonal to the paper transport direction on the surface defined by the transport surface 47 and the transport surface 47. It is an apparatus for moving in a direction orthogonal to the surface to be applied. Specifically, the recovery unit moving mechanism 7 is a device for moving the discharge recovery unit 6 in the horizontal direction (front-rear direction) and the vertical direction.

  With this recovery portion moving mechanism 7, the discharge recovery portion 6 allows the cap member 61 to protect the ink discharge surface 22 (protection position), and the position where the protection of the ink discharge surface 22 by the cap member 61 is released (protection release). Position), and the cap member 61 does not protect the ink discharge surface 22 and moves to a position (standby position) that waits during execution of the image forming operation.

  As shown in FIGS. 2, 6, and 7, the recovery unit moving mechanism 7 includes a frame body 71, a first recovery unit moving mechanism 72, and a second recovery unit moving mechanism 73.

  The frame main body 71 supports the discharge recovery portion 6 so as to be movable in the horizontal direction and the vertical direction. The frame main body 71 has a pair of guide rails 71 a for guiding the movement of the discharge recovery portion 6. The pair of guide rails 71a are arranged in parallel to each other in a direction orthogonal to the paper transport direction. Each of the pair of guide rails 71a is disposed between the support member 62 of the discharge recovery portion 6 and a recovery portion eccentric cam 73a described later.

  Here, each of the pair of guide rails 71a has a substantially Z-shaped cross section. The guide rail 71a having such a cross section is formed long in one direction. Further, as shown in FIGS. 6 and 7, the eccentric cam 73a for the recovery portion can be brought into contact with the support member 62 without interfering with the guide rail 71a in each of the pair of guide rails 71a. A slit 171a is provided. The slit 171a is provided in the guide rail 71a at a position where a surface perpendicular to the axis of the eccentric cam 73a for the recovery portion intersects the guide rail 71a. On each of the pair of guide rails 71a, a roller member 64 for the support member that is rotatably mounted on the wall portion 62b of the support member 62 is placed.

  The first recovery portion moving mechanism 72 is a device for moving the discharge recovery portion 6 in the horizontal direction, and is provided on the frame main body 71. By this first recovery portion moving mechanism 72, the discharge recovery portion 6 is moved in the horizontal direction between the standby position and the protection release position. The first recovery portion moving mechanism 72 includes an engagement portion 72a that engages with the support member 62 of the discharge recovery portion 6 and a drive motor 72b that inputs a driving force to the engagement portion 72a. The engaging portion 72a moves the support member 62 of the ejection recovery portion 6 in a direction orthogonal to the paper transport direction in a state where the transport unit 4A is stopped at a position (separation position) away from the image forming position. In other words, the engaging portion 72a moves the support member 62 of the discharge recovery portion 6 in the horizontal direction (front-rear direction) in a state where the transport unit 4A moves in the direction away from the ink discharge surface 22 and stops.

  Here, an example is shown in which the ejection recovery unit 6 moves in a direction orthogonal to the paper transport direction while the transport unit 4A is stopped at the separation position. However, when a sufficient distance can be ensured between the separation position of the transport unit 4A and the ink ejection surface 22, the ejection recovery can be performed while the transport unit 4A is moving away from the ink ejection surface 22. The unit 6 can be moved in a direction orthogonal to the paper transport direction. That is, if the transport unit 4A and the ejection recovery unit 6 do not collide, the ejection recovery unit 6 is orthogonal to the paper transport direction while the transport unit 4A is moving away from the ink ejection surface 22. You may make it move to the direction to do.

  The drive motor 72b is attached to the frame body 71. In FIG. 2, the drive motor 72 b is fixed inside the corner portion of the frame body 71 (the corner portion at the right back in FIG. 2). A gear is attached to the tip of the motor shaft of the drive motor 72b.

  The engaging portion 72 a is attached to the frame main body 71. The engaging portion 72a includes a first pulley 172a, a second pulley 172b, a third pulley 172c, a fourth pulley 172d, a fifth pulley 172e, a pair of moving belts 272 (272a, 272b), A transmission belt 372.

  The first pulley 172a has a gear (not shown) that meshes with a gear attached to the motor shaft of the drive motor 72b. In FIG. 2, the first pulley 172a is disposed at the right back corner, and the second pulley 172b is disposed at the left back corner. In FIG. 2, the third pulley 172c is disposed at the left front corner, and the fourth pulley 172d is disposed at the right front corner. Further, in FIG. 2, the fifth pulley 172e is disposed at the right back and is arranged side by side with the first pulley 172a.

  The pair of moving belts 272 are provided so as to be circulated along the respective guide rails 71a. One moving belt 272 (272a) is spanned between the first pulley 172a and the fourth pulley 172d. The other moving belt 272 (272b) is bridged between the second pulley 172b and the third pulley 172c. Further, each of the pair of moving belts 272 (272a, 272b) is engaged with the support member 62 of the discharge recovery portion 6. For example, the inner belt of each of the pair of moving belts 272 (272a, 272b) is fixed to the lower surface of the flange portion 62c of the support member 62 of the discharge recovery portion 6.

  The transmission belt 372 is for transmitting the driving force from the drive motor 72b to the one moving belt 272a. The transmission belt 372 is spanned between the fifth pulley 172e and the second pulley 172b. An idle gear 172f is disposed between a gear (not shown) attached to the drive motor and the fifth pulley 172e. The driving force from the drive motor 72b is transmitted to the fifth pulley 172e via the idle gear 172f (the fifth pulley 172e is provided with a gear (not shown) that meshes with the idle gear 172f). Specifically, the driving force from the drive motor 72b is transmitted from the gear attached to the drive motor to the fifth pulley 172e via the idle gear 172f.

  The second recovery portion moving mechanism 73 is a device for moving the discharge recovery portion 6 in the vertical direction, and is provided on the frame main body 71. By the second recovery portion moving mechanism 73, the discharge recovery portion 6 is moved in the vertical direction between the protection position and the protection release position. For example, the second recovery unit moving mechanism 73 discharges and recovers in a direction close to the image forming unit 2 and a direction away from the image forming unit 2 in a state where the discharge recovery unit 6 is located at a position facing the image forming unit 2. The part 6 is moved. Specifically, the second recovery portion moving mechanism 73 is in a state where the support member 62 of the discharge recovery portion 6 is located at a position facing the ink ejection surface 22 (in a state where the support member 62 is located at the protection release position or the protection position). The support member 62 of the ejection recovery unit 6 is moved in a direction close to the ink ejection surface 22 and a direction away from the ink ejection surface 22.

  As shown in FIGS. 6 and 7, the second recovery portion moving mechanism 73 includes a plurality of eccentric cams 73a for the recovery portion and a drive motor device (not shown) for rotationally driving the plurality of eccentric cams 73a for the recovery portion. Not).

  The four eccentric cams 73a for the recovery part are provided on the front side of the frame body 71. Here, two eccentric cams 73a for the recovery part are arranged at a predetermined interval in the longitudinal direction of one guide rail 71a (see FIG. 4), and the remaining two eccentric cams for the recovery part 73a are arranged at a predetermined interval in the longitudinal direction of the other guide rail 71a. FIG. 4 shows a view when the discharge recovery portion 6, the guide rail 71a, and the pair of moving belts 272 are removed.

  The four eccentric cams 73a for the recovery portion are rotatably mounted on the frame body 71. Here, the four eccentric cams 73a for the recovery portion are rotatably mounted on the frame main body 71 so that the rotation axis direction and the direction in which the guide rail 71a extends (longitudinal direction of the guide rail 71a) are parallel to each other. ing.

  The eccentric cam 73a for the recovery portion can come into contact with the support member 62 of the discharge recovery portion 6. For example, the eccentric cam 73a for the recovery portion can pass through the slit 171a formed in the guide rail 71a and can come into contact with the lower surface of the flange portion 62c of the support member 62 of the discharge recovery portion 6.

  The paper holding mechanism 8 is a mechanism for holding the paper on the transport surface 47. As shown in FIG. 1, the sheet holding mechanism 8 includes a suction device 81, for example, a plurality of blower fans, and a motor (not shown) that rotationally drives these blower fans 81. The paper holding mechanism 8 generates a flow of air that passes from above to below through holes provided in the transport belt 41 d by the blower fan 81. As a result, the sheet is sucked and held on the transport surface 47.

  The discharge unit 9 is a part for discharging the sheet on which the image is formed by the image forming unit 2, and is provided at the top of the image forming apparatus 1. The discharge unit 9 includes a plurality of rollers 91, and the sheet on which the image is formed by the image forming unit 2 is conveyed by the conveyance belt 41 d of the conveyance unit 4 </ b> A and the roller 91 of the discharge unit 9. It is discharged outside.

<Operation>
Here, an image forming operation will be described.

  First, when a command for forming an image is issued from a computer connected to the outside, a sheet is sent out from the sheet storage unit 3 to the transport unit 4A. Then, when the paper is being transported by the transport belt 41d of the transport unit 4A, ink is ejected from the inkjet head 21 and an image is formed on the paper. The sheet on which the image is formed is conveyed by the roller 91 of the discharge unit 9 and discharged from the discharge port 92 to the outside of the apparatus. In this way, the image forming operation is executed.

  Next, an outline of the protective operation of the inkjet head 21 will be described.

  The image forming apparatus 1 can form an image when an image forming command is not issued for a predetermined time after the image forming operation ends, or when a power switch (not shown) is turned off. Transition from state to standby state.

  At this time, the transport unit 4A is moved from the image forming position (proximity position) to the separation position by the transport unit moving mechanism 5. When the transport unit 4A is located at the separation position, the ejection recovery unit 6 is moved from the standby position to a predetermined position between the transport unit 4A and the image forming unit 2 by the first recovery unit moving mechanism 72. When the discharge recovery unit 6 is positioned at the protection release position, the discharge recovery unit 6 is moved from the protection release position to the protection position by the second recovery unit moving mechanism 73. Then, the inkjet head 21 is protected by the cap member 61 of the discharge recovery unit 6.

  Here, an example in which the discharge recovery unit 6 starts to move after the transport unit 4A is located at the separation position is shown, but before the transport unit 4A is located at the separation position, the discharge recovery unit 6 6 may start moving.

  On the other hand, in a state where the ink ejection surface 22 is capped by the cap member 61 of the ejection recovery unit 6, when the image formation command is issued or the power switch is turned on, the ejection recovery unit 6 The recovery portion moving mechanism 73 is moved from the protection position to the protection release position. When the discharge recovery unit 6 is positioned at the protection release position, the discharge recovery unit 6 is moved from the protection release position to the standby position by the first recovery unit moving mechanism 72. In this way, the protection of the inkjet head 21 by the cap member 61 of the ejection recovery unit 6 is released. Subsequently, when the ejection recovery unit 6 is positioned at the standby position, the transport unit 4A is moved from the separation position to the image forming position by the transport unit moving mechanism 5. When the transport unit 4A is positioned at the image forming position, the image forming unit 2 can form an image on the paper.

  Here, an example is shown in which the transport unit 4A starts moving after the discharge recovery unit 6 is positioned at the standby position. However, before the discharge recovery unit 6 is positioned at the standby position, the transport unit 4A is started. 4A may start moving.

  Finally, details of the ejection recovery operation of the inkjet head 21 will be described.

  In a state where the inkjet head 21 is protected by the cap member 61 of the discharge recovery unit 6 (including the first discharge recovery unit 260 and the second discharge recovery unit 60), when the discharge recovery command is issued, the discharge recovery unit 6 However, the second recovery unit moving mechanism 73 moves the protection position to the protection release position. Then, the protection of the inkjet head 21 by the cap member 61 of the discharge recovery unit 6 is released. Then, ink is ejected from the inkjet head 21, and the ejected ink is received by the cap member 61.

  Subsequently, the discharge recovery unit 6 is moved in the horizontal direction from the protection release position to the standby position by the first recovery unit moving mechanism 72. That is, the first discharge recovery unit 260 is moved in the horizontal direction (A direction) from the protection release position to the standby position by the first recovery unit moving mechanism 72. Then, the wiper roller member 263 contacts the inkjet head 21, that is, the stepped surface 23 of the inkjet head 21. The tip of the wiper 261 contacts the ink ejection surface 22 of the inkjet head 21. Then, the wiper 261 is positioned by the roller member 263 in a bent state. When the ejection recovery unit 6 is further moved in the horizontal direction by the first recovery unit moving mechanism 72, the wiper 261 moves in the horizontal direction while wiping the ink ejection surface 22. In this way, the ink discharge surface 22 is cleaned by the wiper 261. When the cleaning operation ends, the discharge recovery unit 6 is further moved in the horizontal direction by the first recovery unit moving mechanism 72. Then, the discharge recovery unit 6 is disposed at the standby position.

<Features>
In the image forming apparatus 1, the wiper 261 can be positioned on the ink discharge surface 22 by bringing the roller member 263 (positioning member) of the discharge recovery unit 6 into contact with the ink discharge surface 22. In this state, the ink ejection surface 22 is stably scanned by the wiper 261 by moving the ejection recovery unit 6 in the horizontal direction with respect to the ink ejection surface 22 by the first recovery unit moving mechanism 72. be able to. That is, the ink discharge surface 22 can be reliably cleaned by the wiper 261.

  In the image forming apparatus 1, the wiper 261 and the roller member 263 can be biased toward the ink discharge surface 22 by the wiper spring member 562. For this reason, the roller member 263 can be reliably brought into contact with the ink discharge surface 22. The wiper 261 can be reliably positioned on the ink ejection surface 22. Accordingly, when the ejection recovery unit 6 is moved relative to the ink ejection surface 22 in the horizontal direction by the first recovery unit moving mechanism 72, the ink ejection surface 22 can be stably scanned by the wiper 261. . That is, the ink discharge surface 22 can be reliably cleaned by the wiper 261.

  Further, the wiper 261 can be positioned on the inkjet head 21 by bringing the roller member 263 of the discharge recovery portion 6 into contact with the stepped surface 23 of the inkjet head 21. As a result, even if the ejection recovery unit 6 is moved relative to the inkjet head 21 in the horizontal direction by the first recovery unit moving mechanism 72 in a state where the ink is attached to the inkjet head 21, the ink to the roller member 263 is removed. Can be prevented. That is, the roller member 263 can be prevented from being stained by the ink attached to the inkjet head 21.

[Other Embodiments]
(A) In the above-described embodiment, the discharge recovery unit 6 is moved in the horizontal direction by using a belt and a pulley in the first recovery unit moving mechanism 72. However, the ejection recovery unit 6 may be moved in the horizontal direction using a mechanism different from the above.

  (B) In the above-described embodiment, the sheet is held on the conveyance surface 47 by generating an air flow from the conveyance side 47 toward the opposite side and sucking the sheet. However, the sheet may be held on the transport surface 47 by using a mechanism different from the above, such as using an electric suction method.

  (C) In the above embodiment, an example of a color printer is shown as an embodiment of the image forming apparatus, but the present invention is not limited to this. For example, a multi-function device having a function as a copy machine or a facsimile machine or one having only a copy function may be used. Further, the image processing apparatus is not limited to the one that can form a color image, and may be an image processing apparatus that can form only a monochrome image.

  (D) In the above embodiment, an example in which the ink jet head 21 is provided with the step surface 23 and the roller member 263 contacts the step surface 23 has been described. However, the portion and the member with which the roller member 263 abuts may be used regardless of the embodiment.

  For example, the present invention can be applied even when the ink jet head 21 is not provided with the step surface 23. For example, as shown in FIG. 9, the roller member 263 may be brought into contact with both sides of the ink discharge surface 22 in the short direction. Thus, the wiper 261 can be positioned on the inkjet head 21 even if the roller member 263 is brought into contact with the ink discharge surface 22.

  Further, for example, as shown in FIG. 10, a roller member 263 may be brought into contact with the main body member 24 for an inkjet head. Here, the ink discharge surface 22 of the ink jet head and the main body member 24 for the ink jet head have a step d. In this configuration, the wiper 261 can be positioned on the inkjet head 21 by bringing the roller member 263 into contact with the main body member 24 for the inkjet head. Even in this case, the same effect as the above-described embodiment can be obtained.

  The configuration shown in FIGS. 9 and 10 is basically the same as that of the above embodiment, and therefore, the same reference numerals as those of the above embodiment are given to FIGS. 9 and 10.

1 is a diagram illustrating a schematic configuration of an image forming apparatus. The perspective view which shows the structure of a recovery part moving mechanism. FIG. 3 is a side view of an image forming unit, a discharge recovery unit, a paper transport unit, and a transport unit moving mechanism. The elements on larger scale which show the position of the eccentric cam for recovery parts, and the position of a roller member. Sectional drawing of a discharge recovery part. The figure which looked at the 2nd recovery part movement mechanism from the side (protection release position). The figure which looked at the 2nd recovery part movement mechanism from the side (protection position). The figure which shows the structure of a 1st discharge recovery part. The figure which shows the structure of the 1st discharge recovery | restoration part in other embodiment. The figure which shows the structure of the 1st discharge recovery | restoration part in other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Image forming part 20 Ink discharge part 21 Inkjet head 22 Ink discharge surface 23 Step surface (step part)
24 Main body member for inkjet head 4 Paper transport unit 5 Transport unit moving mechanism 67 Discharge recovery device 6 Discharge recovery unit 260 First discharge recovery unit 261, 261a, 261b Wiper 262 Wiper mounting member 263 Roller member 7 Recovery unit moving mechanism 72 Second 1 Recovery part moving mechanism (moving mechanism)
562 Spring member d Step

Claims (5)

An ejection recovery device that cleans an ink ejection unit that ejects ink onto a recording medium,
A cleaning member that cleans the ink discharge portion while moving in a direction orthogonal to the conveyance direction of the recording medium, a positioning member that positions the cleaning member with respect to the ink discharge portion, and a vertical position below the cleaning member An urging member disposed on the urging member for urging the cleaning member and the positioning member toward the ink ejection unit;
A moving mechanism for moving the discharge recovery portion relative to the ink discharge portion in a state where the positioning member is brought into contact with the ink discharge portion and the cleaning member is positioned with respect to the ink discharge portion;
Equipped with a,
The cleaning member and the positioning member are mounted on a second mounting member having a protruding portion provided to protrude downward,
The biasing member is made of a coil spring member, is fitted and mounted on the projecting portion, and is provided with the second mounting member and a first mounting member disposed to face the lower side of the second mounting member. discharge recovery device that has been sandwiched between. The ink discharge part has an ink jet head in which a step part is formed, and a main body member for the ink jet head to which the ink jet head is mounted,
The cleaning member is positioned on the inkjet head by bringing the positioning member of the ejection recovery portion into contact with the stepped portion of the inkjet head.
The discharge recovery device according to claim 1. The ink discharge part has an ink jet head and a main body member for the ink jet head,
The inkjet head is mounted on the inkjet head body member so that the head surface of the inkjet head and the inkjet head body member have a predetermined step.
The cleaning member is positioned on the inkjet head by bringing the positioning member of the discharge recovery section into contact with the main body member for the inkjet head.
The discharge recovery device according to claim 1. Before Symbol positioning member is a rotary member which is rotatably mounted on the second mounting member,
The discharge recovery device according to any one of claims 1 to 3. A discharge recovery device according to any one of claims 1 to 4,
An image forming unit having the ink discharge unit and forming an image on a recording medium based on image information;
A recording medium transport unit that transports the recording medium to a position facing the ink ejection unit;
An image forming apparatus comprising:

Images