JP2005153413A - Pump unit and liquid jet device - Google Patents

Pump unit and liquid jet device Download PDF

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Publication number
JP2005153413A
JP2005153413A JP2003397791A JP2003397791A JP2005153413A JP 2005153413 A JP2005153413 A JP 2005153413A JP 2003397791 A JP2003397791 A JP 2003397791A JP 2003397791 A JP2003397791 A JP 2003397791A JP 2005153413 A JP2005153413 A JP 2005153413A
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Japan
Prior art keywords
gear
pump unit
pump
driving
drive
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Pending
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JP2003397791A
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Japanese (ja)
Inventor
Mitsutaka Iwasaki
充孝 岩崎
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Seiko Epson Corp
セイコーエプソン株式会社
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Priority to JP2003397791A priority Critical patent/JP2005153413A/en
Publication of JP2005153413A publication Critical patent/JP2005153413A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump unit eliminating solidification of a liquid in the starting and a liquid jet device having the same. <P>SOLUTION: Before a user starts a printer 1 from a non-use condition for a long time period, the user may open a paper supply tray 3 and a paper discharge tray. While the paper supply tray 3 is opened as in the drawing, a gear G4 of the paper supply tray 3 is rotated in a direction of arrow Y. Along with the rotation, a rail R is moved in a direction of arrow B and the gear G3 is rotated in a direction of arrow A. The driving force by the rotation of the gear G3 is transmitted to a driving gear in a gear pump GP via a driving shaft attached to the gear pump GP. As a result, the driving gear is rotated, and then a follower gear is rotated. By rotating the driving gear and the follower gear, it is possible to peel an ink which is adhered to the driving gear and the follower gear by staying to be dried in the gear pump GP. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pump unit and a liquid ejecting apparatus.

  Conventionally, an ink jet recording apparatus is widely known as one of liquid ejecting apparatuses. In this ink jet recording apparatus, ink stored in an ink cartridge is supplied to a recording head via an ink flow path. Then, the supplied ink is ejected from the nozzles formed on the recording head toward the recording medium to form dots to perform recording.

  In general, in this ink jet recording apparatus, in order to reduce ink ejection defects, bubbles, thickened ink, and the like are forcibly sucked from the ink flow path or nozzles by cleaning that applies negative pressure to the nozzles of the recording head as appropriate. Was discarded in the waste ink tank. As a mechanism for generating such a negative pressure, various ink jet recording apparatuses including a pump unit have been proposed. (For example, Patent Document 1).

The ink jet recording apparatus described in Patent Document 1 includes a pump unit including a motor and a gear pump. A cap member is connected to the ink suction port of the gear pump via a suction tube. Further, a waste ink tank is connected to the ink discharge port of the gear pump via a waste ink tube. Then, by transmitting the driving force from the motor to the two gears provided in the pump casing of the gear pump, the gears are rotated to apply a negative pressure to each nozzle of the recording head via the cap member. be able to. The ink sucked from each nozzle by this negative pressure flows into the gear pump from the cap member through the suction tube and the ink suction port, and then is discharged to the waste ink tank through the waste ink tube and the ink discharge port. Further, by configuring the motor as a DC motor or a stepping motor, it is easy to control the number of rotations of the gear pump and select the ink suction amount of the gear pump.
JP-A-6-328730

  However, in the ink jet recording apparatus described in Patent Document 1, when the ink jet recording apparatus remains unused for a long period of time, the ink remaining in the gear pump may dry out and adhere to the gear. . Therefore, when the ink jet recording apparatus is started from a long unused state, the load on the gear in the gear pump has increased. For this reason, the rotational speed of the gear in the gear pump is reduced, the negative pressure applied to the cap member is reduced, and the cleaning effect by the pump unit may be reduced.

  On the other hand, in order to prevent the gear pump from being affected by the sticking of the ink, it is necessary to transmit a driving force exceeding the load to the gear. As a solution to this, there is a method of increasing the output by enlarging the motor. However, if the motor becomes large, it will lead to an increase in the size of the pump unit composed of the motor, and an ink jet that has recently been requested. This will cause an adverse effect on the downsizing of the recording apparatus.

  SUMMARY An advantage of some aspects of the invention is that it provides a pump unit that eliminates the sticking of liquid during start-up and a liquid ejecting apparatus including the pump unit. .

The pump unit of the present invention includes a drive gear that rotates by receiving a driving force and a driven gear that meshes with the drive gear in a pump chamber provided in a main body case having an inlet and an outlet. A housing gear pump and a drive motor for generating a first driving force are provided, and the first driving force is transmitted from the driving motor to the driving gear, whereby the driving gear is rotated and driven. In the pump unit that causes the liquid that has flowed into the pump chamber from the inflow port to flow out of the outflow port by rotating the driven gear, the pump unit includes conversion means for converting an external force into a second driving force. And a transmission means for transmitting the second drive force converted by the conversion means to at least one of the drive gear and the driven gear.

  According to this, the external force is converted and transmitted as the second driving force to the driving gear or the driven gear. By receiving the second driving force, the driving gear or the driven gear can rotate. That is, the drive gear or the driven gear can rotate according to the external force.

  Therefore, for example, when the liquid dries in the pump chamber of the gear pump and is fixed to the driving gear or the driven gear, the driving gear or the driven gear is rotated by applying an external force, and this liquid fixing portion Can be peeled off. As a result, when starting the pump unit from the unused state for a long period of time, the load applied to the drive gear and the driven gear can be reduced by applying an external force to the pump unit. The rotation speed can be prevented from being lowered, and the suction effect by the gear pump can be prevented from being lowered.

The second driving force of the pump unit is configured to act only in a specific direction on the driving gear or the driven gear.
According to this, since the gear inside the gear pump rotates only when an external force is applied in a specific direction, the gear always rotates only in a specific direction and does not reverse. Therefore, the gear pump is attached to the cap member. In some cases, it is possible to prevent ink from flowing back and leaking from the cap member.

  The conversion means of the pump unit is a conversion gear that rotates in response to an external force, and the transmission means includes a transmission gear that is drivingly connected to the drive gear, and teeth that mesh with the transmission gear and the conversion gear, respectively. The rail member moves with the rotation of the conversion gear, and the transmission gear is rotated by this movement.

  According to this, when an external force is applied, the conversion gear rotates, and accordingly, the rail member moves and the transmission gear rotates. When the transmission gear rotates, the drive gear drivingly connected to the transmission gear rotates, and the driven gear also rotates. Therefore, for example, when the liquid is dried in the pump chamber of the gear pump and fixed to the drive gear or the driven gear, the liquid fixing portion can be peeled off by applying an external force. And this conversion gear can be comprised so that the external force accompanying opening and closing of the hinge structure can be obtained, for example by attaching to the base end part of a hinge structure. As a result, when the pump unit is started from an unused state for a long period of time, the load on the drive gear and the driven gear can be reduced by opening and closing the hinge structure. A reduction in speed can be prevented, and a reduction in suction effect by the gear pump can be prevented.

The conversion means of the pump unit is a conversion lever that moves in response to an external force, and the transmission means can be directly connected to the first connection member and the first connection member that are drivingly connected to the drive gear. The pump unit is configured to directly connect the first connection member and the second connection member when the conversion lever moves. did.

  According to this, when an external force is applied, the conversion lever moves, and accordingly, the second connecting member that is drivingly connected to the conversion lever moves. At this time, since the second connecting member is directly connected to the first connecting member, the first connecting member can also move. Since the first connecting member is drivingly connected to the driving gear of the gear pump, the driving gear rotates, and the driven gear rotates accordingly. Therefore, for example, when the liquid dries in the pump chamber of the gear pump and is fixed to the drive gear or the driven gear, the liquid fixing portion can be peeled off by applying an external force. And this conversion lever can obtain the external force by the opening and closing by comprising so that it may move with opening and closing of a hinge structure, for example. As a result, when the pump unit is started from a long-term unused state, the liquid fixing portion can be peeled off by an external force from the conversion lever, and the load on the drive gear and the driven gear can be reduced. A decrease in the rotational speed of the drive and driven gears can be prevented, and a decrease in the suction effect by the gear pump can be prevented. Moreover, this pump unit can also obtain the same effect by directly moving the conversion lever.

The conversion lever of the pump unit includes release means for releasing direct connection between the first connection member and the second connection member in accordance with the movement thereof.
Thus, by releasing the direct connection between the first connecting member and the second connecting member, the gear pump is not affected by an external force and is driven only by the first driving force transmitted from the driving motor. can do. As a result, the gear pump can be driven stably without being restricted by the conversion lever.

  The liquid ejecting apparatus of the present invention is a liquid ejecting apparatus including the pump unit of the present invention, and the liquid ejecting apparatus includes a frame and a movable part movably attached to the frame, and the conversion means. Was linked to the movable part.

  According to this, when the movable part of the liquid ejecting apparatus is moved, the external force generated by the movement is converted into the second driving force and transmitted to the driving gear of the gear pump via the transmitting means. Since the gear pump is driven in accordance with the second driving force, when the liquid dries in the pump chamber of the gear pump and adheres to the drive gear or the driven gear, the liquid adhering portion is peeled off. Can do.

  In the liquid ejecting apparatus, a liquid ejecting head that ejects liquid, the pump unit that cleans the liquid ejecting head, and liquid discharged from the liquid ejecting head via the pump unit are stored in the frame. When the movable part moves to start the liquid ejecting apparatus, the external force generated by the movement is converted into the second driving force by the converting means. And transmitting to the drive gear via the transmission means.

  According to this, when the movable part is moved at the time of starting the liquid ejecting apparatus, the external force generated by the movement is converted into the second driving force and transmitted to the driving gear of the gear pump via the transmitting means. Since the gear pump is driven in accordance with the second driving force, when the liquid dries in the pump chamber of the gear pump and adheres to the drive gear or the driven gear, the liquid adhering portion is peeled off. Can do.

  As a result, even when the liquid ejecting apparatus is started from an unused state for a long period of time, it is possible to reduce the load applied to the drive gear and the driven gear, thereby preventing a decrease in the rotational speed of the drive and driven gear in the gear pump. This can prevent a reduction in the cleaning effect of the gear pump.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view for explaining the outline of the printer of the first embodiment.
As shown in FIG. 1, a printer 1 as a liquid ejecting apparatus includes a substantially rectangular frame 2. A paper feed tray 3 is provided on the upper surface of the frame 2, and a paper discharge tray 4 is provided on the front surface of the frame 2. The paper feed tray 3 and the paper discharge tray 4 are configured to be foldable and housed in the frame 2 by a hinge structure (not shown).

  A platen 5 is disposed in the longitudinal direction of the frame 2, and recording paper inserted into the frame 2 from the paper feed tray 3 is fed onto the platen 5 by a paper feed mechanism (not shown). It has become so. The fed recording sheet is discharged from the discharge tray 4 to the outside of the frame 2.

  A guide member 6 is installed in the frame 2 so as to be parallel to the platen 5. A carriage 7 that is movable along the guide member 6 is inserted into and supported by the guide member 6. A carriage motor (not shown) is attached to the frame 2, and the carriage 7 is connected to the carriage 7 via a timing belt (not shown) hung on a pair of pulleys (not shown). Has been. With this configuration, when the carriage motor is driven, the driving force is transmitted to the carriage 7 via the timing belt. In response to this driving force, the carriage 7 is guided by the guide member 6 and reciprocates in parallel (main scanning direction) with the platen 5.

  On the other hand, a recording head 8 as a liquid ejecting head is provided on the lower surface of the carriage 7 (the surface facing the platen 5). The recording head 8 has a nozzle forming surface so as to face the recording paper, and a nozzle row (not shown) composed of n nozzles (n is a natural number) per row is formed on the nozzle forming surface. Six rows are formed. In this embodiment, six nozzle rows each consisting of n nozzles per row are formed for convenience of explanation, but this is not restrictive, and the number of nozzles and the number of nozzle rows per row may be changed as appropriate. .

  The recording head 8 has colors corresponding to the respective nozzles (in this embodiment, black, cyan, magenta, yellow, light cyan, and light magenta) from an ink cartridge (not shown) provided in the frame 2 as a liquid reservoir. Ink as a liquid is supplied. The ink flowing into the recording head 8 is pressurized by a piezoelectric element (not shown) and ejected as ink droplets from the nozzles of the recording head 8 to form dots. That is, black, magenta, cyan, yellow, light cyan, and light magenta, which are corresponding colors, are ejected from the nozzles formed in the recording head 8, respectively.

  In the printer 1, an area for printing by ejecting ink droplets onto a recording sheet while reciprocating the carriage 7 is used as a printing area. Further, the printer 1 is provided with a non-printing area for sealing the nozzles during non-printing, and a cap holder 9 is provided in the non-printing area as shown in FIG.

As shown in FIG. 1, the cap holder 9 is provided with a flexible cap member 10 so as to face the nozzle formation surface of the recording head 8. The cap holder 9 seals each nozzle by bringing the cap member 10 into close contact with the nozzle forming surface of the recording head 8 via a drive mechanism (not shown). The cap holder 9 has a communication port (not shown) that communicates with the cap member 10 at the bottom, and the communication port is connected to the pump unit 11 via a tube T1. Further, a waste ink tank 12 is connected to the pump unit 11 via a tube T2.

  The pump unit 11 applies a negative pressure to the cap member 10 via the tube T1. That is, when the nozzle is sealed by the cap member 10, by operating the pump unit 11, a negative pressure can be applied in the space formed by the cap member 10 and the nozzle forming surface of the recording head 8. As a result, bubbles and adhering ink with high viscosity can be sucked out from the flow path or nozzle in the recording head 8, and so-called choke cleaning can be performed. The sucked ink is discharged to the waste ink tank 12 via the pump unit 11.

Next, the configuration of the above-described pump unit will be described with reference to FIGS.
As shown in FIG. 2, the pump unit 11 includes a motor M and a gear pump GP. As shown in FIGS. 3 and 4, the gear pump GP includes a substantially rectangular main body case 13, and the main body case 13 is formed of an upper case 13 a and a lower case 13 b. A pump chamber 14 is recessed in the lower case 13b. In the pump chamber 14, the drive gear G <b> 1 and the driven gear G <b> 2 are accommodated so as to be able to rotate while meshing with each other. Then, by attaching the upper case 13a to the lower case 13b, the main body case 13 seals the pump chamber 14 containing the drive gear G1 and the driven gear G2. A drive shaft 15 is attached to the drive gear G1 accommodated in the pump chamber 14 so as to penetrate from the outside of the main body case 13 (lower case 13b). As shown in FIG. 2, a pulley P <b> 1 is connected and fixed to the drive shaft 15 outside the main body case 13. The pulley P1 is drivingly connected to a pulley (not shown) attached to the driving shaft of the motor M via a timing belt TB. With this configuration, the driving force of the motor M is transmitted to the driving gear G1 via the timing belt TB, the pulley P1, and the driving shaft 15.

  On the other hand, the driven gear G <b> 2 is inserted through a driven shaft 17 disposed in the main body case 13. The driven gear G2 meshes with the drive gear G1 as described above, and when the drive gear G1 rotates in the direction of the arrow in FIG. 3, it is driven to rotate in the direction of the arrow. With this configuration, the driving force of the motor M transmitted to the driving gear G1 is further transmitted to the driven gear G2. In the pump chamber 14, the space of the pump chamber 14 in which the teeth of the drive gear G1 and the driven gear G2 are separated from each other based on the fact that the drive gear G1 and the driven gear G2 mesh with each other and rotate in the direction of the arrows. The part is referred to as an introduction part S1. Further, a space portion of the pump chamber 14 where the teeth of the drive gear G1 and the driven gear G2 merge is defined as a lead-out portion S2.

  As shown in FIG. 4, the upper case 13a of the main body case 13 has a side surface (a surface that forms a pair with the surface to which the pulley P1 is attached) and corresponds to the introduction portion S1 and the lead-out portion S2. An ink suction port 18 and an ink discharge port 19 are respectively formed at the positions where the ink is discharged. The ink suction port 18 communicates with the introduction portion S1 of the pump chamber 14 formed in the main body case 13. The ink discharge port 19 communicates with a lead-out portion S2 of the pump chamber 14 formed in the main body case 13. The tube T1 is connected to the ink suction port 18, and the tube T2 is connected to the ink discharge port 19. As a result, the pump unit 11 including the gear pump GP is connected to the cap member 10 and the waste ink tank 12 as described above.

With this configuration, when the motor M is driven, the driving gear G1 and the driven gear G2 rotate in the directions of the arrows, respectively, receiving the driving force. As a result, the ink introduced from the ink suction port 18 into the introduction portion S1 of the pump chamber 14 is guided to the lead-out portion S2 of the pump chamber 14 by the drive gear G1 and the driven gear G2. The ink guided to the derivation unit S2 is discharged to the ink discharge port 19. That is, a negative pressure is generated in the cap member 10, and the ink sucked from the cap member 10 through the tube T1 can be discarded into the waste ink tank 12 through the tube T2.

  On the other hand, the motor M is driven and controlled in accordance with an electrical signal output from a control circuit (not shown) provided in the printer 1. As a result, the pump unit 11 performs cleaning by supplying a negative pressure to the cap member 10 based on a control signal from the control circuit.

  As described above, the pump unit 11 configured in this manner is disposed in the frame 2 and in the vicinity of the paper feed tray 3 (see FIG. 1). As shown in FIG. 2, a cover C is attached to the side surface of the gear pump GP so as to cover the pulley P1, the drive shaft of the motor M, and the pulley. A one-way clutch 20 is attached to the cover C. The one-way clutch 20 includes a gear G3. The one-way clutch 20 transmits only the driving force generated by the one-way rotation of the gear G3 to the driving shaft 15 of the gear pump GP.

  More specifically, the driving force generated by the rotation is transmitted to the drive shaft 15 only when the gear G3 rotates in the direction of arrow A in FIG. The direction of rotation of the drive shaft 15 by this driving force is the same as the rotation of the drive gear G1 shown in FIG.

  Therefore, when the gear G3 rotates in the direction of the arrow A in FIG. 2, the one-way clutch 20 makes the gear G3 idle and does not transmit the driving force of the gear G3 to the drive shaft 15. That is, the rotation of the gear G3 in the direction of the arrow A shown in FIG. 2 prevents the drive gear G1 from rotating in the direction of the arrow shown in FIG.

  A rail R is provided in the frame 2 in the vicinity of the pump unit 11 so as to be movable in the front-rear direction (front direction and rear direction of the printer 1). A first tooth 21 and a second tooth 22 are formed at both ends of the rail R, and a missing tooth portion 23 having no teeth is formed between the first and second teeth 21 and 22. . And this 1st tooth | gear 21 meshes | engages the said gear G3. More specifically, when the gear G3 and the first tooth 21 are in mesh with each other as shown in FIG. 5, when the rail R moves forward (in the direction of arrow B in the figure), the gear G3 Along with this, it rotates in the direction of the arrow A. At this time, the rotation of the gear G3 in the direction indicated by the arrow B is transmitted to the drive shaft 15 by the one-way clutch 20. When the rail R moves a predetermined distance in the direction of the arrow B, the first tooth 21 is disengaged from the gear G3, and the missing tooth portion 23 is opposed to the gear G3, and the meshing between the first tooth 21 and the gear G3 is released. Is done. Therefore, even if the rail R moves further in the B arrow direction, the gear G3 does not rotate in the A arrow direction.

  On the other hand, when the rail R moves in the rear direction (counter B arrow direction), the gear G3 rotates in the counter A arrow direction. At this time, the rotation of the gear G3 in the direction opposite to the arrow B is not transmitted to the drive shaft 15 by the one-way clutch 20.

  Further, the second teeth 22 of the rail R mesh with a gear G4 fixed to a support shaft SH fixed to a support arm 3a at a base end portion of the paper feed tray 3. The support shaft SH is the rotation center of the paper feed tray 3 and rotates with the rotation of the paper feed tray 3. Therefore, when the paper feed tray 3 rotates, the gear G4 rotates with the support shaft SH. More specifically, when the paper feed tray 3 is rotated from the closed state shown in FIG. 5 to the open state shown in FIG. 6, the gear G4 rotates in the Y arrow direction. . When the gear G4 meshed with the second tooth 22 rotates in the Y arrow direction, the rail R moves in the B arrow direction.

  When the rail R moves in the B arrow direction, the gear G3 meshing with the first teeth 21 rotates in the A arrow direction. That is, the drive shaft 15 is rotated in the arrow direction in FIG. When the paper feed tray 3 is opened about half way, the rail R moves in the direction of arrow B to the position where the first teeth 21 are disengaged from the gear G3. As a result, the meshing between the first tooth 21 and the gear G3 remains released thereafter, and the gear G3 does not rotate in the direction of the arrow A even if the paper feed tray 3 is further opened.

Accordingly, the drive shaft 15, that is, the drive gear G1 and the driven gear G2 can be rotated by simply opening the paper feed tray 3 and not by driving the motor M.
On the other hand, when the paper feed tray 3 is rotated from the state shown in FIG. 6 to the state shown in FIG. 5 in order to close the paper feed tray 3, the rail R moves in the direction opposite to the arrow B. Until the paper feed tray 3 is closed by about half, the meshing between the first teeth 21 and the gear G3 remains released, so the gear G3 does not rotate. When the paper feed tray 3 is completely closed from the half-closed position, the meshing of the first teeth 21 and the gear G3 causes the gear G3 to rotate in the direction of the arrow A. At this time, the rotation of the gear G3 in the anti-A arrow direction is not transmitted to the drive shaft 15 by the one-way clutch 20.

  Next, an operation when the user uses the printer 1 configured as described above will be described. This printer 1 is assumed to be unused for a long period of time, and the ink remaining in the gear pump GP of the pump unit 11 is dried and fixed to the drive gear G1 and the driven gear G2.

  When the user starts the printer 1 from a long unused state, first, the paper feed tray 3 and the paper discharge tray 4 are opened. At this time, as shown in FIG. 5, by opening the paper feed tray 3, the gear G4 of the paper feed tray 3 rotates in the Y arrow direction, and the rail R moves in the B arrow direction along with this rotation. Then, the gear G3 is rotated in the direction of arrow A. The driving force generated by the rotation of the gear G3 is transmitted to the driving gear G1 in the gear pump GP through the driving shaft 15 attached to the gear pump GP. As a result, the drive gear G1 in the gear pump rotates in the direction of the arrow shown in FIG. 3, and the driven gear G2 is also driven and rotated. Then, by rotating the drive gear G1 and the driven gear G2, the ink remaining in the gear pump GP and dried and fixed to the drive gear G1 and the driven gear G2 can be peeled off. That is, the ink fixed to the drive gear G1 and the driven gear G2 in the gear pump GP can be peeled off by the user opening the paper feed tray 3 when the printer 1 is started.

  Further, when the motor M of the pump unit 11 is driven according to the electric signal from the control circuit, the peeled ink is discharged from the ink discharge port 19 toward the waste ink tank 12 by the ink flowing into the gear pump GP. The

  Further, when the paper feed tray 3 of the printer 1 reciprocates in the opening or closing direction due to contact or the like, as described above, the drive gear G1 in the gear pump GP does not rotate in the counter-arrow direction shown in FIG. Therefore, the ink flowing into the gear pump GP does not flow backward. Accordingly, ink leakage from the cap member 10 due to backflow can be prevented, and the reliability of the pump unit 11 can be improved.

As described above, according to the first embodiment described above, the following effects are provided.
(1) In this embodiment, the gear G3 is connected to the drive shaft 15 attached to the gear pump GP via the one-way clutch 20, and the gear G3 is engaged with the first teeth 21 of the rail R. Then, the second tooth 22 of the rail R and the gear G4 fixed to the support shaft SH are engaged with each other, and the driving force generated by opening the paper feed tray 3 is transmitted to the driving gear G1 of the gear pump GP. The gear G1 is configured to rotate.

With this configuration, when the printer 1 is started, the ink fixed to the drive gear G1 and the driven gear G2 in the gear pump GP can be peeled off by the user opening the paper feed tray 3. As a result, even when the printer 1 is unused for a long period of time, the load on the drive gear G1 and the driven gear G2 can be reduced, and the reduction in the cleaning effect by the gear pump GP can be prevented.

Also, since the ink fixed in the gear pump GP is peeled off, the pump unit 11 can be reduced in size without increasing the motor M, so that the printer 1 including the pump unit 11 can be reduced in size. be able to.
(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS.

In the present embodiment, for the sake of convenience of explanation, portions that are different from the first embodiment will be described, and the same portions will be denoted by the same reference numerals and description thereof will be omitted.
As shown in FIG. 7, the pump unit 30 of the present embodiment includes a gear pump GP and a motor M configured in the same manner as in the first embodiment. A cam mechanism 31 is attached to the cover C attached to the side surface of the gear pump GP. The cam mechanism 31 includes a support case 32 and a cam plate 33, and the support case 32 and the cam plate 33 are attached to the cover C so as to form a space in opposition to each other. In the cam mechanism 31, as shown in FIG. 8, the lever L, the spring member S, the ring 34, the one-way clutch 35, and the shaft 36 are placed in the space formed (between the support case 32 and the cam plate 33). The dog clutch plates D1, D2 are arranged.

  The lever L includes a cylindrical portion 37 formed in a cylindrical shape and an arm 38 that extends from the cylindrical portion 37. Two claw portions 39 are formed at the edge of the cylindrical portion 37 so as to protrude toward the gear pump GP. The one-way clutch 35 is inserted into the hole 37 a of the cylindrical portion 37 and is fixed so as to be integrated with the lever L. A shaft 36 is inserted into the hole 35a of the one-way clutch 35, and a dog clutch plate D1 formed in a disk shape is fixed to the end portion (on the pump unit 11 side) of the shaft 36. Yes. The dog clutch plate D1 is formed with a protrusion 40 projecting from the disc-shaped plane toward the gear pump GP. The shaft 36 provided with the dog clutch plate D1 is inserted and supported in the hole 32a of the support case 32 via the one-way clutch 35 integrated with the lever L as described above. The one-way clutch 35 is for transmitting a force in a fixed direction to the shaft 36. The one-way clutch 35 transmits a force to the shaft 36 only when the one-way clutch 35 rotates in the forward direction, and the coaxial 36 is integrated. It is designed to rotate forward. With this configuration, the shaft 36 can rotate integrally with the lever L only when the lever L moves in the forward direction (X arrow direction). That is, the dog clutch plate D1 fixed to the shaft 36 is also rotated in the X arrow direction only when the lever L is moved in the X arrow direction. A ring 34 and a spring member S are inserted through the shaft 36 so as to be positioned between the lever L and the support case 32. The spring member S comes into contact with the support case 32 and the one-way clutch 20 integrated with the lever L, and is positioned by being fitted to the ring 34. The lever L is biased toward the gear pump GP by the spring member S.

On the other hand, the dog clutch plate D2 is fixed to the end of the drive shaft 15 so as to directly face the dog clutch plate D1. The dog clutch plate D2 is inserted and supported in a hole 33a formed in a cylindrical shape in the cam plate 33, and is rotatable. In addition, the cam plate 33 has a convex portion 41 protruding toward the support case 32 so as to be positioned at the edge of the hole portion 33a. The dog clutch plate D2 has a plurality of holes 42 on its disk-shaped plane. The hole 42 has such a size that the protrusion 40 of the dog clutch plate D1 is fitted when the dog clutch plate D1 and the dog clutch plate D2 are overlapped. Therefore, the shaft 36, the dog clutch plates D1 and D2, and the drive shaft 15 can be rotated together by fitting the projection 40 into the hole 42. With this configuration, when the lever L rotates in the forward direction when the dog clutch plates D1 and D2 are overlapped and the protrusion 40 is fitted in any one of the holes 42, the shaft 36 is moved forward. Accordingly, the drive shaft 15 is also rotated in the forward direction. Further, as described above, since the lever L is biased toward the gear pump GP, the dog clutch plate D1 is always biased so that the protrusion 40 is fitted to the hole portion 42.

  On the other hand, the lever L is biased by the spring member S so that the claw portion 39 can come into contact with the convex portion 41 of the cam plate 33. And the nail | claw part 39 is contact | abutted or spaced apart with respect to the convex part 41 by moving the lever L to the front and back. In the present embodiment, when the arm 38 of the lever L is in the highest position (initial state) in the vertical direction, the dog clutch plates D1 and D2 overlap each other as shown in FIG. 40 and the hole 42 are fitted. When the arm 38 of the lever L is moved in the X arrow direction from this initial state, the shaft 36 rotates in the X arrow direction as viewed from the right side surface of the pump unit 30 shown in FIG. Further, the drive shaft 15 also rotates in the X arrow direction. As a result, the drive gear G1 in the gear pump GP also rotates in the X arrow direction (pre-marked direction shown in FIG. 3), and the driven gear G2 is driven by this rotation in the anti-X arrow direction (arrow direction shown in FIG. ) To rotate.

  Further, when the arm 38 of the lever L is in the lowest position in the horizontal direction (use state), the claw portion 39 of the lever L contacts the convex portion 41 of the cam plate 33 as shown in FIG. It comes to touch and ride. The lever L resists the urging force of the spring member S when the claw portion 39 rides on the convex portion 41.

  That is, when the arm 38 of the lever L is in use, the lever L resists the biasing force of the spring member S, so that the dog clutch plate D1 is separated from the dog clutch plate D2, and accordingly, the protrusion 40 is In FIG. 10, only one hole 42 is shown for convenience of explanation. As a result, the drive force due to the movement of the arm 38 of the lever L is not transmitted to the drive shaft 15, so that the drive gear G1 and the driven gear G2 in the gear pump GP do not rotate. Further, when the lever L moves from the use state to the initial state, the driving force is not transmitted to the shaft 36 by the one-way clutch 35, so the driving shaft 15 does not rotate, and the driving gear G1 and the driven gear G2 are , Not to rotate.

  In this embodiment, the pump unit 30 configured as described above is disposed in the frame 2 of the printer 1 and in the vicinity of the paper discharge tray 50. The discharge tray 50 can be folded and stored in the frame 2 of the printer 1 as in the first embodiment. As shown in FIG. 11, the arm 38 of the lever L of the cam mechanism 31 is attached to the right end portion of the paper discharge tray 50, and moves forward and backward as the paper discharge tray 50 opens and closes. It is like that. At this time, the arm 38 is in an initial state when the paper discharge tray 4 is closed (see FIG. 11), and is used when the paper discharge tray 50 is open (see FIG. 12). Attached to.

  Next, an operation when the user uses the printer 1 configured as described above will be described. In the printer 1, as in the first embodiment, the ink remaining in the gear pump GP of the pump unit 30 is dried and fixed to the drive gear G1 and the driven gear G2.

When the user starts the printer 1 from the unused state for a long time, the paper feed tray 3 and the paper discharge tray 50 are opened. At this time, the arm 38 of the lever L moves from the initial state shown in FIG. 11 to the use state shown in FIG. At this time, as described above, by moving the arm 38 of the lever L in the X arrow direction, the drive gear G1 can be rotated, and the driven gear G2 can be driven and rotated. Then, by rotating the drive gear G1 and the driven gear G2, the ink fixed to the drive gear G1 and the driven gear G2 can be peeled off. That is, the ink fixed to the driving gear G1 and the driven gear G2 in the gear pump GP can be peeled off by the user opening the paper discharge tray 50 when the printer 1 is started.

  Next, as shown in FIG. 12, when the paper discharge tray 50 is opened and in use, as described above, the dog clutch plates D1 and D2 are separated (see FIG. 10), and the driving force is transmitted to the drive shaft 15. No longer. That is, when the printer 1 is used, the gear pump GP can be driven stably only by the driving force transmitted from the motor M without being affected by the movement of the paper discharge tray 50. As in the first embodiment, when the motor M of the pump unit 30 is driven according to the electric signal from the control circuit, the peeled ink is discarded from the ink discharge port 19 by the ink flowing into the gear pump GP. The ink is discharged toward the ink tank 12.

Next, when the start-up of the printer 1 is completed and the paper discharge tray 50 is closed, the driving force is not transmitted to the shaft 36 by the one-way clutch 35, and it does not rotate. Therefore, the gear pump does not rotate in the reverse direction (in the direction opposite to the arrow X in FIG. 7), and ink leakage from the cap member can be prevented.
As described above, according to the above-described second embodiment, the following effects can be obtained.
(3) The pump unit 30 of the present embodiment is configured to transmit the driving force generated by the movement of the arm 38 of the lever L to the driving gear G1 of the gear pump GP. In the printer 1, the pump unit 30 is attached to the paper discharge tray 50. As a result, the ink fixed to the drive gear G1 and the driven gear G2 in the gear pump GP can be peeled off by the user opening the paper discharge tray 50 when the printer 1 is started. Further, with this configuration, the rail R is not provided in order to transmit the driving force to the driving shaft 15 as compared with the first embodiment, so that space is saved and the arrangement in the frame 2 is achieved. The degree of freedom of position can be improved. Thereby, the restriction on the layout of the printer 1 can be reduced, and downsizing can be realized.

In addition, embodiment of invention is not limited to said each embodiment, You may change as follows.
The pump unit 11 of the first embodiment is configured to transmit the driving force by the act of opening the paper feed tray 3 to the driving gear G1 of the gear pump GP. You may comprise so that a driving force can be transmitted suitably to the drive gear G1. At this time, it is desirable to change the printer 1 as appropriate.

  In the pump unit 30 of the second embodiment, the arm 38 of the lever L of the cam mechanism 31 is attached to the paper discharge tray 50, and the driving force due to the opening action is transmitted to the driving gear G1 of the gear pump GP. However, the present invention is not limited to this. At this time, it is desirable that the pump unit 30 and the printer 1 are appropriately changed so that the driving force accompanying opening and closing of the paper feed tray 3 can be suitably transmitted to the driving gear G1.

Further, the arm 38 of the lever L may be configured to be directly movable by the user. For example, the arm 38 may be configured to be attached to one side surface of the frame 2. As a result, the user can remove the ink fixed in the gear pump GP at his / her favorite timing by directly moving the arm 38 of the lever L without using the paper feed tray 3 or the paper discharge tray 50. Thereby, the user can make the gear pump GP more suitable.

  In the above embodiment, the pump units 11 and 30 including the gear pump GP are configured to flow ink to the waste ink tank. However, the present invention is not limited to this. For example, the ink is supplied from the ink cartridge to the recording head 8. You may comprise as follows.

  In the first embodiment, six colors of ink are supplied from the ink cartridge. However, the present invention is not limited to this. For example, seven colors of ink may be provided in the ink cartridge. At this time, it is desirable to appropriately change the configuration of the printer 1.

  In the above-described embodiment, the liquid ejecting apparatus is embodied in the printer 1. However, the present invention is not limited to this, and the liquid ejecting apparatus may be embodied in a liquid ejecting apparatus that ejects another liquid. For example, as a liquid ejecting apparatus for ejecting liquids such as electrode materials and color materials used in the manufacture of liquid crystal displays, EL displays, and surface-emitting displays, as a liquid ejecting apparatus for ejecting bioorganic materials used in biochip manufacturing, and as precision pipettes The sample injection device may be used. And in connection with this, you may change the pump units 11 and 30 suitably.

FIG. 2 is a perspective view for explaining an outline of the printer of the first embodiment. The perspective view for demonstrating the pump unit of the embodiment. The top view for demonstrating the structure of a gear pump. The perspective view for demonstrating the structure of the gear pump. The side view for demonstrating the relationship between a paper feed tray and a pump unit. The side view for demonstrating the relationship between a paper feed tray and a pump unit. The perspective view for demonstrating the outline of the pump unit of 2nd Embodiment. The disassembled perspective view for demonstrating the structure of the cam mechanism of the embodiment. The top view for demonstrating the structure of the cam mechanism. The top view for demonstrating the structure of the cam mechanism. The perspective view for demonstrating the relationship between a paper discharge tray and a pump unit. The perspective view for demonstrating the relationship between a paper discharge tray and a pump unit.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Printer as liquid ejecting apparatus, 2 ... Frame, 3 ... Paper feed tray as movable part, 4, 50 ... Paper discharge tray as movable part, 8 ... Recording head as liquid ejecting head, 11, 30 ... Pump Unit: 12 ... Waste ink tank as waste liquid tank, 13 ... Main body case, 14 ... Pump chamber, 18 ... Ink suction port as inflow port, 19 ... Ink discharge port as outflow port, 21, 22 ... Tooth, 39 ... Claw part as release means, D1... Dog clutch plate as second connecting member, D2... Dog clutch plate as first connecting member, G1... Driving gear, G2 .. driven gear, G3. G4 ... Gear as conversion means and conversion gear, GP ... Gear pump, L ... Lever as conversion lever, M ... Motor as drive motor, R ... Race as rail member .

Claims (7)

  1. A gear pump that houses a drive gear that rotates by receiving a driving force and a driven gear that meshes with the driving gear in a pump chamber provided in a main body case that forms an inlet and an outlet;
    A drive motor that generates a first drive force, and transmitting the first drive force from the drive motor to the drive gear, thereby rotating the drive gear to drive the driven gear. In the pump unit that causes the liquid flowing into the pump chamber from the inlet to flow out from the outlet by rotating,
    The pump unit is
    Conversion means for converting an external force into a second driving force;
    A pump unit comprising: a transmission unit configured to transmit the second driving force converted by the conversion unit to at least one of the driving gear and the driven gear.
  2. The pump unit according to claim 1, wherein
    The pump unit, wherein the second driving force is configured to act only in a specific direction with respect to the driving gear or the driven gear.
  3. The pump unit according to claim 1 or 2,
    The conversion means is a conversion gear that rotates in response to an external force,
    The transmission means includes a transmission gear that is drivingly connected to the drive gear, and a rail member that includes teeth that mesh with the transmission gear and the conversion gear,
    The rail unit is configured to move with the rotation of the conversion gear, and to rotate the transmission gear by the movement.
  4. The pump unit according to claim 1 or 2,
    The conversion means is a conversion lever that moves in response to an external force,
    The transmission means includes a first connecting member that is drivingly connected to the drive gear, and a second connecting member that can be directly connected to the first connecting member and is drivingly connected to the conversion lever.
    The pump unit is configured to directly connect the first connecting member and the second connecting member when the conversion lever moves.
  5. The pump unit according to claim 4,
    The said conversion lever is provided with the releasing means which cancels | releases the direct connection of a said 1st connection member and a said 2nd connection member according to the movement, The pump unit characterized by the above-mentioned.
  6. A liquid ejecting apparatus comprising the pump unit according to any one of claims 1 to 5,
    The liquid ejecting apparatus includes:
    A frame and a movable part movably attached to the frame;
    A liquid ejecting apparatus, wherein the conversion means is interlocked with the movable part.
  7. The liquid ejecting apparatus according to claim 6,
    The liquid ejecting apparatus includes:
    In the frame, a liquid ejecting head for ejecting liquid,
    The pump unit for cleaning the liquid jet head;
    A waste liquid tank for storing liquid discharged from the liquid ejecting head via the pump unit;
    Further, when the movable portion moves to start the liquid ejecting apparatus, the external force generated by the movement is converted into the second driving force by the converting means, and the driving gear is transmitted via the transmitting means. A liquid ejecting apparatus configured to transmit to the liquid.
JP2003397791A 2003-11-27 2003-11-27 Pump unit and liquid jet device Pending JP2005153413A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003397791A JP2005153413A (en) 2003-11-27 2003-11-27 Pump unit and liquid jet device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003397791A JP2005153413A (en) 2003-11-27 2003-11-27 Pump unit and liquid jet device

Publications (1)

Publication Number Publication Date
JP2005153413A true JP2005153413A (en) 2005-06-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003397791A Pending JP2005153413A (en) 2003-11-27 2003-11-27 Pump unit and liquid jet device

Country Status (1)

Country Link
JP (1) JP2005153413A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015128612A (en) * 2011-02-16 2015-07-16 セクアナ メディカル エージー Apparatus and method for treatment of fluid retention

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015128612A (en) * 2011-02-16 2015-07-16 セクアナ メディカル エージー Apparatus and method for treatment of fluid retention

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