JP2017081120A - Ink jet recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet recording device which can prevent insufficient operation of a user with respect to switching operation of a valve in a supply passage of ink from an ink tank to a recording head.SOLUTION: An ink jet recording device comprises: a recording head; an ink tank; a valve (displacement member 83, cam member 84, cover member 85) which can be switched between an open state such that the ink can be supplied to the recording head from the ink tank and a closed state such that supply of the ink from the ink tank to the recording head is blocked; and an operation part 42 which is rotatably pivoted and is movable between a first position (a) and a second position (c). The valve is in the open state when the operation part is positioned at the first position, and the valve is switched from the open state to the closed state in the middle of movement of the operation part from the first position to the second position. When the operation part is stopped at a position (b) between the first position and a closed position at which the valve is switched from the open state to the closed state, the operation part is moved from the position toward the first position.SELECTED DRAWING: Figure 9

Description

  The present invention relates to an ink jet recording apparatus that records an image by discharging ink.

  Patent Literature 1 includes a flexible tube that supplies ink stored in an ink tank to a recording head, and a valve unit that manually switches the flow state of ink between the ink tank and the recording head. An apparatus is disclosed. The valve unit includes a pivotable cam and a displacement member that can be displaced between a position where the tube is opened and a position where the tube is closed, and the displacement member as the cam is rotated manually. Is displaced and rubs against the convex portion of the cam. According to this device, when the displacement member is displaced, it is necessary to get over the convex portion of the cam, so that the resistance feeling during the cam rotation operation changes, and it is easy for the user to displace the displacement member by manual operation. Can be recognized.

JP 2014-58086 A

  However, even if the configuration is such that the completion of the operation can be easily recognized by changing the operational feeling as in the device described in Patent Document 1, the user does not always continue the operation until the operation is completed. . It is also assumed that the operation is terminated before the operational feeling changes, or that the operation is terminated while the operational feeling is changing. When the user finishes the operation halfway, the valve does not sufficiently close the tube, and there is a possibility that ink leaks to the outside when ink is injected into the ink tank or when the apparatus main body is transported.

  The present invention has been made in view of the above problems, and provides an ink jet recording apparatus that can prevent an insufficient operation of a user regarding the operation of a valve in an ink supply path from an ink tank to a recording head. With the goal.

  In order to solve the above problems, an ink jet recording apparatus according to the present invention includes a recording head that discharges ink to record an image, and an injection unit that is provided in the apparatus main body and injects ink supplied to the recording head. And an ink tank that stores ink, an open state in which ink can be supplied from the ink tank to the recording head, and a closed state in which supply of ink from the ink tank to the recording head is blocked And an operation member that is pivotally supported and movable between a first position and a second position. When the operation member is at the first position, the valve is An ink jet recording apparatus that is in the open state and in which the valve is switched from the open state to the closed state while the operating member moves from the first position to the second position. When the operation member stops at a position between the first position and the closed position where the valve switches from the opened state to the closed state, the operating member moves from the position toward the first position. It is characterized by moving.

  According to the present invention, it is possible to provide an ink jet recording apparatus that can prevent a user's insufficient operation regarding the operation of a valve in an ink supply path from an ink tank to a recording head.

1 is a schematic diagram illustrating an ink jet recording apparatus according to a first embodiment. It is the schematic which shows the ink supply system which concerns on 1st Embodiment. FIG. 3 is a schematic diagram illustrating a positional relationship between an ink tank and a recording head in the first embodiment. 1 is a perspective view of an ink jet recording apparatus according to a first embodiment. FIG. 2 is a schematic diagram illustrating a state of an ink tank and a recording head in the first embodiment. It is a flowchart of the ink filling sequence in 1st Embodiment. 1 is a block diagram of an ink jet recording apparatus according to a first embodiment. It is the schematic which shows the valve unit which concerns on 1st Embodiment. It is a schematic diagram which shows the inside at the time of closing operation of the valve unit which concerns on 1st Embodiment. It is a figure explaining the relationship between the obstruction | occlusion position and switching position in obstruction | occlusion operation of the valve unit which concerns on 1st Embodiment. It is the schematic which shows the operation part of the valve unit which concerns on 1st Embodiment. It is a perspective view which shows the operation part with which closing operation is easy at the time of transport of the valve unit which concerns on 1st Embodiment. It is a perspective view which shows an inkjet recording device provided with the operation part with which closing operation is easy at the time of transport of the valve unit which concerns on 1st Embodiment. It is the schematic which shows the operation part of the valve unit which concerns on 2nd Embodiment.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic view showing an ink jet recording apparatus according to the first embodiment of the present invention. The ink jet recording apparatus 11 includes a recording head 13 that is detachably mounted on the carriage 12, discharges ink, an ink supply path 14 for supplying ink to the recording head 13, and an ink tank 15 that stores ink. The inkjet recording apparatus 11 includes a feeding roller (not shown) that feeds a sheet (recording medium), a transport roller 16 that transports the recording medium, and a discharge roller (not shown) that discharges the recording medium. . Further, the ink jet recording apparatus 11 has an ink suction mechanism in which a suction cap is brought into contact with the recording head 13 to recover the ejection performance of the recording head 13 and ink is sucked from the ink ejection port 31 of the recording head 13 by a tube and a pump. 52.

  FIG. 2 is a schematic view showing an ink supply system of the ink jet recording apparatus according to the present embodiment. The ink tank 15 is provided on the front surface of the ink jet recording apparatus 11. The ink tank 15 is provided for each corresponding ink color. In the present embodiment, four ink tanks are provided: a black ink tank 151, a cyan ink tank 152, a magenta ink tank 153, and a yellow ink tank 154. A tube constituting an ink supply path 14 for supplying ink to the recording head is attached to the ink tank 15. The ink tank 15 is provided with a tube constituting an atmosphere communication path 25 for communicating the inside of the ink tank with the atmosphere. The tube is made of a flexible material such as an elastomer. An ink injection port (injection unit) 21 for injecting ink is provided in the upper part of the ink tank 15. A tank cap 22 for sealing the ink injection port 21 is attached to the ink injection port 21. The user can inject ink into the ink tank 15 from the ink injection port 21 by removing the tank cap 22. Further, a valve unit (valve) that blocks communication of ink or air between the ink tank 15 and the recording head 13 in the ink supply path 14 and between the ink tank 15 and the atmosphere communication port 23 in the atmosphere communication path 25. 24 are provided. The valve unit 24 includes a black side valve unit and a color side valve unit. The black side valve unit closes (blocks) the ink supply path and the atmosphere communication path connected to the black ink tank 151. The color side valve unit closes the ink supply path and the atmosphere communication path connected to the cyan ink tank 152, the magenta ink tank 153, and the yellow ink tank 154, respectively.

  FIG. 3 is a schematic diagram showing the positional relationship between the ink tank 15 and the recording head 13. In the present ink jet recording apparatus, the gas-liquid exchange unit 32 of the ink tank 15 is H lower than the ink discharge port 31 of the recording head 13 in the height direction in order to prevent ink from leaking from the ink discharge port 31 of the recording head. Provided in position. That is, the ink discharge port 31 is configured to apply a negative pressure due to a water head difference corresponding to the height H. A buffer chamber 33 is provided below the ink tank 15. The buffer chamber 33 can store the pushed-out ink when the air in the ink storage chamber 34 that stores the ink expands due to a change in atmospheric pressure or a temperature change. Accordingly, it is possible to prevent ink from leaking from the ink tank 15 through the atmosphere communication path 25.

  Next, the configuration of the ink supply system according to the present embodiment and the flow from the ink injection to the printing operation (recording operation) will be described with reference to FIGS.

  FIG. 4 is a perspective view of the ink jet recording apparatus according to the present embodiment. As shown in FIG. 4A, the inkjet recording apparatus 11 is provided with a scanner unit 41 (second cover member) having a reading unit capable of reading an image of a stacked document. The scanner unit 41 is pivotally supported by the apparatus main body so as to be opened and closed. When the user injects ink, the scanner unit 41 is first opened, and the scanner unit 41 is opened as shown in FIG. Below the scanner unit 41, an operation unit (operation member) 42 for opening and closing the valve unit 24 is provided. The operation unit 42 is pivotally supported so as to be movable between a position (first position) that is tilted forward and a position (second position) that is raised. The operation unit 42 also has a function as a cover (first cover member) that covers the ink injection port 21 of the ink tank 15. When injecting ink, as shown in FIG. 4C, it is necessary to perform an operation of lifting the operation unit 42 covering the ink injection port 21 (opening the cover). The valve unit 24 operates in conjunction with the operation of lifting the operation unit 42, and the ink supply path 14 and the atmosphere communication path 25 are respectively closed (FIG. 5A).

  Next, the user removes the tank cap 22 attached to the ink inlet 21 and injects ink from an ink bottle (not shown) into the ink inlet 21. After the ink injection is completed, the tank cap 22 is attached to the ink injection port 21 again, and the operation unit 42 is tilted forward (close the cover). When the operation unit 42 is tilted forward, the valve unit 24 operates in conjunction with the operation, and the ink supply path 14 and the atmosphere communication path 25 are opened. Thereafter, the user closes the scanner unit 41.

  When the scanner unit 41 is closed, in order to fill the ink supply path 14 with ink in the ink tank 15, a suction operation is performed in which the suction cap is brought into contact with the recording head 13 to suck ink from the ink discharge port 31. (FIG. 5B). By this suction operation, ink is filled into the tube constituting the ink supply path 14. When ink is ejected from the ink ejection port 31 by printing or the like in a state of being filled with ink, the ink is supplied from the ink tank 15 to the recording head 13 by the amount corresponding to the decrease in ink from within the recording head 13. The ink is continuously supplied from the ink tank 15 to the recording head 13 until the ink in the ink tank 15 becomes a predetermined amount or less.

  FIG. 6 is a flowchart of an ink filling sequence executed when the suction operation is performed. When the ink filling sequence is started, first, in S61, the carriage 12 holding the recording head 13 is moved to a suction position where the ink suction mechanism 52 is located. Next, in S <b> 62, the suction cap of the ink suction mechanism 52 is brought into contact with the recording head 13. In S <b> 63, a suction operation for sucking ink from the ink discharge port 31 of the recording head 13 is performed by the ink suction mechanism 52. After the suction operation is completed, the suction cap and the recording head 13 are separated from each other in S64. In step S65, the carriage 12 is moved from the suction position to the standby position.

  FIG. 7 is a block diagram of the ink jet recording apparatus according to the present embodiment. Reference numeral 701 denotes an MPU that controls the operation of each unit, data processing, and the like. A ROM 702 stores programs and data executed by the MPU 701. Reference numeral 703 denotes a RAM that temporarily stores processing data executed by the MPU 701 and data received from the host computer 714. The recording head 13 is controlled by a recording head driver 707. The carriage 12 is driven by a carriage motor 704. The carriage motor 704 is controlled by a carriage motor driver 708. The feed roller, the transport roller 16 and the discharge roller are driven by a transport motor 705. The carry motor 705 is controlled by the carry motor driver 709. The host computer 714 has a printer driver 7141 for processing recording information such as a recorded image and image quality and communicating with an ink jet recording apparatus when a user instructs execution of a recording operation. The MPU 701 exchanges recorded images and the like with the host computer 714 via the I / F unit 713.

  Next, the configuration of the valve unit 24 according to this embodiment will be described. FIG. 8 is a schematic view showing a valve unit according to the present embodiment. The valve unit 24 holds tubes 81 constituting the ink supply path 14 and the atmosphere communication path 25, respectively. The valve unit 24 includes a holding member (tube holding member) 82 that holds the tube 81, and a displacement member 83 that is configured to be displaceable in the Z direction in FIG. 8 and presses the tube 81 to close the tube 81. The valve unit 24 includes a cam member 84 that is pivotally supported and has a cam surface that slides on the displacement member 83, a cover member 85 that supports the cam member 84 and is fixed to the holding member 82, And an operation portion 42 that is locked to the cam member 84 and is operated by the user to rotate.

  Next, an operation in which the valve unit 24 according to the present embodiment closes the ink supply path 14 and the atmosphere communication path 25 will be described. FIG. 9 is a schematic diagram showing the inside of the valve unit according to the present embodiment during the closing operation. FIG. 9A shows a state where the displacement member 83 does not crush the tube 81 (open state). At this time, the displacement member 83 is in a position (release position) where the tube 81 is not pressed in the Z direction. Moreover, the operation part 42 exists in the position (1st position) which fell forward (FIG.4 (b)). In this state, the ink supply path 14 is open, and ink can be supplied from the ink tank 15 to the recording head 13. The atmosphere communication path 25 is also opened, and the interior of the ink tank 15 communicates with the atmosphere. When the operation unit 42 is lifted from this state, the cam member 84 rotates counterclockwise in FIG. Then, as shown in FIG. 9B, when the convex portion with respect to the rotation center of the cam surface of the cam member 84 comes into contact with the displacement member 83, the displacement member 83 is displaced in the −Z direction in FIG. Then, the tube 81 is crushed. And when a displacement member rotates to the position (pressing position) which presses and closes the tube 81, sufficient amount of the tube will be crushed (closed state). At this time, the operation unit 42 is in the lifted position (second position) (FIG. 4C). In this state, the ink supply path 14 is closed, and ink cannot be supplied from the ink tank 15 to the recording head 13. Further, the atmosphere communication path 25 is also closed, and the interior of the ink tank 15 and the atmosphere do not communicate.

  Next, the problem to be solved by the present invention and the function and effect of the present invention will be described in detail.

  First, the ink supply path 14 and the atmosphere communication path 25 need to be closed when the ink is injected into the ink tank 15 as described above, or when the apparatus main body is transported after ink filling. If the ink supply path is not blocked when the ink is injected, the ink liquid level in the ink tank 15 may be higher than the height of the ink discharge port 31 (FIG. 3). At this time, if the tank cap 22 of the ink injection port 21 is removed, a pressure due to a water head difference corresponding to the height Hm is applied to the ink discharge port 31. As a result, the ink may leak from the ink discharge port 31 and the inside of the apparatus may be soiled. On the other hand, if the atmosphere communication path 25 is not blocked, the ink may flow into the buffer chamber. In such a case, there is a possibility that the role of the buffer chamber 33 for storing the ink pushed out when there is a change in atmospheric pressure or a change in temperature cannot be sufficiently exhibited. Further, if the ink supply path 14 and the atmosphere communication path 25 are not blocked when the apparatus main body is transported, the ink in the ink tank 15 is transferred to the ink discharge port 31 and the air communication when the apparatus main body is largely inclined during the transportation. There is a risk of leakage from the mouth 23 to the outside.

  In order to solve such a problem, the valve needs to reliably block the tube at the time of ink injection or transportation of the main body. For this purpose, a mechanism that automatically opens and closes the valve using a mechanical drive source or a sensor that can detect whether the valve is open or closed is provided, and a warning (alert) is issued when it is detected that the valve is not sufficiently closed. It is conceivable to make such a configuration. However, when such a configuration is used, the manufacturing cost is increased.

  In this embodiment, in the valve unit by manual operation as shown in FIG. In this embodiment, in order to prevent an insufficient closing operation of the valve, when the operation is stopped halfway without completing the operation in the closing operation, the operation unit returns to the position before the operation starts. To do. On the other hand, when the valve closing operation is completed to the end, the operation unit is stopped at the operation end position. As a result, the user can recognize whether or not the valve closing operation has been performed correctly.

  The first characteristic part in the present embodiment for performing the above-described operation will be described in detail.

  FIG. 9 is a schematic diagram showing the inside of the valve unit according to the present embodiment during the closing operation. As shown in FIG. 9A, when the displacement member 83 crushes the tube 81 in the valve closing operation, the displacement member 83 receives the reaction force F of the tube 81 in the + Z direction. In response to this reaction force F, the displacement member 83 comes into contact with the cam member 84. 9A to 9C, the tangent line at the contact point between the cam member 84 and the displacement member 83 and the straight line connecting the contact point between the rotation center of the cam member 84 and the displacement member 83. The formed angle θ varies depending on the operation angle φ of the operation unit. As shown in FIG. 9B, when θ <90 °, the reaction force F acts as a moment for rotating the cam member 84 clockwise. On the other hand, as shown in FIG. 9C, when θ≈90 °, the reaction force F does not act as a moment for rotating the cam member 84. Therefore, when the operation is stopped at the position shown in FIG. 9B, if the clockwise moment applied to the cam member 84 exceeds the moment due to the frictional force between the cam member 84 and the displacement member 83 or the cover member 85, the operation is performed. The unit 42 rotates toward a position (first position) before the operation is started. When the operation is stopped at the position shown in FIG. 9C, the operation unit 42 stops. As in the case where the angle θ is 90 °, there is a position where the presence / absence of the moment applied to the cam member 84 and the direction are switched in the valve opening / closing operation. This position is referred to as a switching position. In the present embodiment, this switching position is set so as to be a position after the valve has passed the position (blocking position) where the tube 81 is blocked. Thereby, when the operation is stopped before the valve closes the tube 81, the operation unit 42 returns to the position before the operation start (first position).

  FIG. 10 is a diagram for explaining the relationship between the closing position and the switching position in the closing operation of the valve unit. In FIG. 10, the horizontal axis is the operation angle φ of the operation unit 42, the first axis of the vertical axis is the distance T between the holding member 82 and the displacement member 83, and the second axis of the vertical axis is the rotation center of the cam member 84. An angle θ formed by a straight line connecting the contact points of the displacement member 83 is shown. In this embodiment, the outer diameter of the tube 81 is 3.8 mm, and the wall thickness is 1 mm. In order to close the tube 81, it is necessary to crush the tube 81 until the outer diameter of the tube 81 becomes 1.5 mm in the Z direction. Therefore, in FIG. 10, the position P1 at which the first axis T on the vertical axis is 1.5 mm is the closed position. Further, when the operation angle φ≈80 °, the angle θ≈90 °. The position P2 at this time is the switching position described above. Here, the switching position P2 is set to a position where T is 1 mm. In this switching position P2, the valve is in a state of sufficiently closing the tube 81. Thus, the switching position P2 is provided at a position after the closing position P1 in the valve closing operation. Thereby, even when the user stops the operation in a state where the tube 81 is not closed, the operation unit 42 returns to the position before the operation start (first position), and the operation has not been completed for the user. Can be recognized. In the present embodiment, the angle θ is set to 90 ° at the switching position P2, but the present invention is not limited to this. For example, by setting so that θ> 90 °, the operation unit 42 may move toward the second position after exceeding the closing position P1.

  Next, the second characteristic part in this embodiment will be described in detail.

  By adjusting the positions of the closing position P1 and the switching position P2 as described above, a moment can be applied to the cam member 84 in the direction of opening the tube when an insufficient operation is performed. However, in order for the cam member 84 to actually move, the moment applied to the cam member 84 must exceed the frictional force between the cam member 84 and the displacement member 83 or the cover member 85. Therefore, in the present embodiment, the moment due to the weight of the operation unit 42 is applied toward the first position.

  FIG. 11 is a schematic view showing the operation unit 42 of the valve unit. As shown in FIG. 11A, the operation unit 42 is in a substantially horizontal posture at the first position. The moment due to the own weight W of the operation unit 42 is applied clockwise in FIG. 11, that is, in the direction toward the first position. On the other hand, as illustrated in FIG. 11B, when the operation unit 42 is moved toward the second position, the operation unit 42 is brought into a posture in which the operation unit 42 approaches a vertical position. The moment in the direction towards the position decreases. In the present embodiment, the operation unit 42 is configured such that the angle between the first position and the second position is 90 ° or more. Between the position where the operation unit 42 is in the vertical posture and the second position, the operation unit 42 receives a moment that rotates in the direction toward the second position due to its own weight W. By adopting such a configuration, it is possible to apply a moment to the operation unit 42 in the direction toward the first position in the region from the first position to the front of the closing position where the operation angle φ is small. Further, in the region where the operation angle φ is large and exceeds the closing position, the moment applied to the operation unit 42 can be reduced, or the moment can be applied in the direction toward the second position.

  In the present embodiment, as described above, the operation unit 42 of the valve unit also serves as a cover for the ink injection port 21. Therefore, when ink is injected, an operation (blocking operation) for lifting the operation unit 42 upward is always required. As a result, it is possible to prevent a situation in which the valve unit is not closed when ink is injected.

  Furthermore, in this embodiment, a sensor (not shown) that can detect the opening / closing of the scanner unit 41 is provided, and the recording operation cannot be performed when the scanner unit 41 is detected to be open. . When the operation unit 42 is lifted upward (when the cover is opened), when the scanner unit 41 is closed, the scanner unit 41 abuts on the operation unit 42 and cannot be closed (closed). It is configured such that the state is suppressed). That is, the scanner unit 41 needs to be closed before the recording operation is performed, and before the scanner unit 41 is closed, an operation (opening operation) is required to tilt the operation unit 42 forward. Therefore, before the recording operation is performed, the opening operation of the valve unit is always performed, and the recording operation is performed in a state where the tube is not opened, and it is possible to prevent a situation in which ink is not supplied to the recording head 13.

  In this embodiment, as described above, the scanner unit 41 cannot be closed in the closed state. Therefore, in order to transport the apparatus main body with the scanner unit 41 closed and the tube 81 closed, the operation unit 42 must be removed from the cam member 84. Therefore, in the valve unit, the operation unit 121 may be provided on the axis of the cam member 84 as shown in FIG. 13 is a perspective view of an ink jet recording apparatus including the operation unit 121 shown in FIG. The operation unit 121 is provided on the axis of the cam member 84 and outside the apparatus main body. With this configuration, the valve can be operated by the operation unit 121 provided outside the apparatus regardless of whether the scanner unit 41 is opened or closed. By adopting a configuration in which the operation unit is provided outside the apparatus in this manner, the valve can be easily closed without removing the operation unit during transportation of the apparatus main body.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. Note that the description of the same configuration as in the first embodiment is omitted.

  FIG. 14 is a schematic view showing an operation part of a valve unit according to the second embodiment of the present invention. In the valve unit according to the present embodiment, as shown in FIG. 14, a tension spring (biasing means) 141 is attached to the operation portion 42. The tension spring 141 applies a moment in the direction toward the first position as shown in FIG. 14A in the vicinity of the first position by urging the operation unit 42. Further, the tension spring 141 is provided in the vicinity of the second position so as to apply a moment in the direction toward the second position as shown in FIG. By adjusting the position at which the fulcrum of the tension spring 141 is provided, it is possible to adjust the switching position P2 at which the direction in which the moment is applied is switched. Here, during the closing operation, the switching position P2 is set to be a position after the closing position P1. Thereby, when the operation is stopped in the area before the closing position P1, the operation unit 42 can be returned to the position before the operation start (first position). Further, when the operation is stopped in the area after the switching position P2, the operation unit 42 can be moved to the second position in the closed state.

  This embodiment is effective when, for example, a material having a low elastic modulus is used for the tube 81, the reaction force F of the tube described above is small, and the configuration of the first embodiment cannot sufficiently operate the operation unit. It is a simple configuration. As described above, the present invention can also be realized by a configuration using a spring force.

DESCRIPTION OF SYMBOLS 11 Inkjet recording device 13 Recording head 15 Ink tank 24 Valve unit 42 Operation part 81 Tube 82 Holding member 83 Displacement member 84 Cam member

Claims (22)

A recording head for recording an image by discharging ink;
An ink tank which is provided in the apparatus main body and has an injection portion for injecting ink to be supplied to the recording head;
A valve that can be switched between an open state in which ink can be supplied from the ink tank to the recording head and a closed state in which supply of ink from the ink tank to the recording head is blocked;
An operation member that is pivotally supported and movable between a first position and a second position;
The valve is in the open state when the operating member is in the first position, and the valve is closed from the open state during the movement of the operating member from the first position to the second position. An inkjet recording apparatus that switches to a state,
When the operation member stops at a position between the first position and the closed position where the valve switches from the open state to the closed state, the operation member moves from the position toward the first position. An ink jet recording apparatus.   When the operating member stops at a position between the first position and a switching position between the closed position and the second position, the operating member is moved from the position to the first position. 2. The ink jet recording apparatus according to claim 1, wherein the ink jet recording apparatus moves toward the head. A tube for connecting the ink tank and the recording head and supplying ink from the ink tank to the recording head;
The valve has a displacement member that is displaceable between a pressing position that presses the tube to make the closed state and a release position that releases the pressing of the tube and makes the opening state,
The operation member has a cam member that is pivotally supported so as to be slidable with the displacement member when the displacement member is displaced from the release position to the pressing position. Inkjet recording device.   The switching position is when the angle formed by the rotation center of the cam member, the straight line connecting the contact point of the cam member and the displacement member, and the tangent line of the cam member at the contact point is a predetermined angle. The inkjet recording apparatus according to claim 3, wherein the inkjet recording apparatus is a position of the operation member.   The inkjet recording apparatus according to claim 4, wherein the predetermined angle is an angle of approximately 90 °.   The inkjet recording apparatus according to claim 4, wherein the predetermined angle is an angle of 90 ° or more.   7. The operation member according to claim 2, wherein a moment is applied in a direction toward the first position by its own weight at least between the first position and the switching position. Inkjet recording apparatus.   The moment applied in the direction at the third position between the first position and the second position is the moment applied in the direction at the fourth position between the third position and the second position. The inkjet recording apparatus according to claim 7, wherein the inkjet recording apparatus is larger than the inkjet recording apparatus.   The biasing means for biasing the operation member in a direction toward the first position at least between the first position and the switching position is further provided. The inkjet recording apparatus according to Item.   10. The operation member according to claim 2, wherein when the operation member stops at a position between the switching position and the second position, the operation member moves from the position toward the second position. 2. An ink jet recording apparatus according to item 1.   The valve is in the closed state when the operating member is in the second position, and the valve is released from the closed state while the operating member moves from the second position to the first position. The ink jet recording apparatus according to claim 1, wherein the ink jet recording apparatus is switched to a state.   12. The ink jet recording apparatus according to claim 1, wherein the operation member is a first cover member that can be opened and closed to cover the injection portion.   13. The valve is set to the closed state when the first cover member is open, and the valve is set to the open state when the first cover member is closed. 2. An ink jet recording apparatus according to 1.   The inkjet recording apparatus according to claim 1, further comprising a cap for sealing the injection portion.   The inkjet recording apparatus according to claim 1, wherein the ink tank is provided on a front surface of the apparatus main body.   The ink tank includes an ink storage chamber for storing ink to be supplied to the recording head, and a buffer chamber provided below the ink storage chamber and provided with an air communication path communicating with the atmosphere. The ink jet recording apparatus according to claim 1.   The inkjet recording apparatus according to claim 16, wherein the valve closes the atmosphere communication path when the valve is in the closed state, and releases the blockage of the atmosphere communication path when the valve is in the open state.   The inkjet recording apparatus according to claim 16 or 17, wherein the atmosphere communication path is configured by a flexible tube connected to the ink tank. A second cover member pivotally supported by the apparatus main body so as to be opened and closed;
The first cover member cannot be operated when the second cover member is closed, and the first cover member can be operated when the second cover member is open. An ink jet recording apparatus according to any one of claims 1 to 18. A detection means capable of detecting opening and closing of the second cover member;
When it is detected that the second cover member is in a closed state, a recording operation can be performed, and when it is detected that the second cover member is in an open state, a recording operation cannot be performed. The ink jet recording apparatus according to claim 19.   21. The inkjet recording apparatus according to claim 19, wherein the second cover member is prevented from being closed when the operation unit is in the second position. The inkjet recording apparatus according to claim 19, wherein the second cover member is a scanner unit having a reading unit capable of reading an image of a document.

Images