Drive switching device, image recording device, control method and program

Abstract

To provide a drive switching device capable of determining the appropriate switching drive amount. [Solution] One embodiment of the present invention is a drive switching device characterized by comprising: a drive source; a driven part that is driven by a driving force generated by the drive source, and includes at least a first driven part and a second driven part that are selectively driven by drive switching; a transmission means for transmitting the driving force to the driven part; a switching means for performing a drive switch from the first driven part to the second driven part when a first switching operation amount is applied to the switching means; and a control unit that corrects the switching operation amount applied to the switching means from the first switching operation amount to the second switching operation amount when the drive switch from the first driven part to the second driven part has not been performed when the first switching operation amount is applied to the switching means.

Description

[Technical Field]

[0001] The present disclosure relates to the technology of a drive switching device provided with a plurality of drive means and a switching unit that selectively switches a drive destination. [Background Art]

[0002] A conventional image recording apparatus includes a paper feeding means for feeding paper, which is a recording material, into the image recording apparatus, a conveying means for conveying the fed paper, and a recording means for recording on the conveyed paper. Among such image recording apparatuses, an inkjet recording apparatus includes a recording head as a recording means, includes a recovery means for maintaining normal ink ejection, and further includes a drive source, a drive transmission mechanism, and the like for operating each of the mechanisms described above. Further, a configuration provided with a drive transmission switching mechanism for selectively distributing and transmitting the driving force of one drive source to a plurality of mechanisms is known.

[0003] According to Patent Document 1, by moving a planetary gear to a combined position of a support shaft and a pushing position, it is possible to transmit the driving force from one drive source to one of a plurality of drive destinations. [Prior Art Documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2024-36131 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-17993 [Patent Document 3] Japanese Patent Application Laid-Open No. 2013-233813 [Summary of Invention] [Problem to be Solved by the Invention]

[0005] In order to achieve drive switching with the mechanism described in Patent Document 1, precise movement of the planetary gear is essential. However, due to individual differences and deterioration over time, the amount of switching operation will vary, so it is necessary to determine the appropriate amount of switching operation for each individual unit.

[0006] In view of the above issues, this disclosure aims to provide a drive switching device capable of determining an appropriate switching drive amount. [Means for solving the problem]

[0007] One embodiment of the present invention is a drive switching device characterized by comprising: a drive source; a driven part that is driven by a driving force generated by the drive source, and includes at least a first driven part and a second driven part that are selectively driven by drive switching; a transmission means for transmitting the driving force to the driven part; a switching means for performing a drive switch from the first driven part to the second driven part when a first switching operation amount is applied to the switching means; and a control unit that corrects the switching operation amount applied to the switching means from the first switching operation amount to the second switching operation amount when the drive switch from the first driven part to the second driven part has not been performed when the first switching operation amount is applied to the switching means. [Effects of the Invention]

[0008] This disclosure makes it possible to provide a drive switching device capable of determining an appropriate switching drive amount. [Brief explanation of the drawing]

[0009] [Figure 1] Perspective view of the recording device [Figure 2] Cross-sectional view of the recording device [Figure 3] schematic diagram of the drive unit [Figure 4] Perspective view of the drive transmission switching mechanism [Figure 5] Diagram illustrating the contact means [Figure 6] Diagram showing the drive connection position of the drive transmission switching section. [Figure 7] Perspective view and schematic cross-sectional view showing a first drive transmission switching operation [Figure 8] Perspective view and schematic cross-sectional view showing a second drive transmission switching operation [Figure 9] Perspective view and schematic cross-sectional view showing a third drive transmission switching operation [Figure 10] Perspective view of the drive switching unit in the first embodiment [Figure 11] Diagram showing a state when the drive switching unit is moved in the axial direction (comparison between a conventional configuration and a first modification) [Figure 12] Diagram showing the shape of the drive transmission switching unit in the second embodiment [Figure 13] Block diagram of a recording apparatus [Figure 14] Flowchart of drive switching abnormal behavior detection processing [Figure 15] Flowchart of switching operation amount correction processing [Figure 16] Explanatory diagram of the problem of the present embodiment [Figure 17] Explanatory diagram of the problem of the present embodiment [Figure 18] Explanatory diagram of the effect of the first embodiment [Figure 19] First example of drive switching configuration to which the present embodiment can be applied [Figure 20] Second example of drive switching configuration to which the present embodiment can be applied DETAILED DESCRIPTION OF EMBODIMENTS

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0011] First Embodiment Figure 1 is a perspective view showing the internal configuration of the image recording device (abbreviated as "recording device") M in this embodiment. The recording device M is a multifunction device equipped with a printing unit and a scanner unit (not shown) positioned above the printing unit, and various processes related to image recording and reading operations can be performed individually or in conjunction between the printing unit and the scanner unit. The scanner unit is equipped with an ADF (Automatic Document Feeder) and an FBS (Flatbed Scanner), and can read documents automatically fed by the ADF and read (scan) documents placed on the FBS platen by the user. Although this embodiment is a multifunction device that combines a printing unit and a scanner unit, it may also be configured without a scanner unit.

[0012] The printing unit consists of the following: a first paper feed unit 1 and a second paper feed unit 2 into which the user loads recording media; a transport unit 3 that transports the recording media fed from the paper feed units; a recording unit 4 that records images on the recording media being transported by the transport unit 3; and a paper discharge unit 8 that loads the recording media after the images have been recorded and discharged. The paper discharge unit 8 consists of a recording media loading unit 81 and an extension tray 82 that can be pulled out from the recording device M that supports the recording media, even when the size of the recording media is large. Furthermore, it consists of a maintenance unit 5 that performs maintenance on the recording unit 4, and a drive unit 6 that uses the drive of a transport motor 31 located in the transport unit 3 to switch the drive to one of the first paper feed unit 1, the second paper feed unit 2, or the maintenance unit 5 and transmit the drive. All of these units are fastened to a base 7 to form the printing unit. In this specification, the drive target driven by the drive unit 6 is referred to as the driven unit.

[0013] Figure 2 is a cross-sectional view showing a series of steps for recording an image on the recording medium of the recording device M in this embodiment. There are two methods for the user to set the recording medium on which to record an image. The first is to set the recording medium in the first paper feed unit 1 by loading the recording medium P1 onto the pressure plate 11. The second is to set the recording medium P2 in the second paper feed unit 2 by loading the recording medium P2 into a cassette case 21 that is detachable from the recording device M and attaching it to the recording device M. When the user's print information is commanded to the recording device M, the transport motor 31 rotates in the forward direction. When paper is fed from the first paper feed unit 1, the drive unit 6 and the first paper feed unit 1 are connected by drive. Paper feeding begins when the pressure plate 11 makes drive contact with the first paper feed roller 12, which rotates under the drive of the transport motor 31. A separation roller 13 is positioned opposite the first paper feed roller 12, providing resistance to the paper feeding direction of the recording medium. As a result, only the top sheet of paper among the recording medium P1 stacked on the pressure plate 11 is fed to the transport section as indicated by F1.

[0014] Furthermore, when paper is fed from the second paper feeding unit 2, the drive unit 6 and the second paper feeding unit 2 are connected by drive. The drive of the transport motor 31 is transmitted to the second paper feeding shaft gear 23 via the drive unit 6. The second paper feeding roller 25 rotates via a plurality of second paper feeding idler gears 24 from the second paper feeding shaft gear 23, and only the top sheet of paper among the recording media P2 loaded in the cassette case 21 is fed. By providing a separation unit 26 that provides resistance to the feeding direction on the fed recording media, even if multiple recording media are fed, only the top sheet of paper in contact with the second paper feeding roller 25 is fed by the separation unit 26. Next, the drive is transmitted to the intermediate gear 27 and intermediate roller 28 via a gear drive train (not shown) of the drive unit 6. A driven roller 29 is positioned opposite the intermediate roller 28 and feeds the recording media fed from the second paper feeding roller 25 to the transport unit 3 as shown by F2. When the recording media fed from each paper feeding unit passes through the detection lever 14, the positions of the left and right leading edges of the recording media in the width direction are aligned with respect to the transport direction by the transport roller pair consisting of the transport roller 32 and the pinch roller 33 that follows the transport roller 32.

[0015] The recording unit 4 consists of a carriage 41 equipped with a recording head 42, a chassis 44 supporting the carriage 41, and chassis rails 46. The carriage 41 can reciprocate in a scanning direction perpendicular to the transport direction of the fed recording medium. The recording medium, transported by a pair of transport rollers, passes over a platen 36 that biases the recording medium and is located opposite the recording unit. During this passage, an image is recorded on the recording medium by the recording head 42 while the carriage 41 is scanning.

[0016] When recording an image on only one side of the recording medium, the process ends when the recording medium is ejected to the paper discharge section 8 through the paper discharge roller pair of the paper discharge roller 34 and spur 35, as shown in F3. When recording an image on both sides of the recording medium, after recording the image on one side of the recording medium, the transport motor 31 is rotated in reverse while the rear end of the recording medium is being held. Then, the paper discharge roller pair and the transport roller pair rotate in the opposite direction to the transport direction in which the image is recorded, and the recording medium can be transported to the reverse transport path, as shown in F4. When the rear end of the recording medium in the transport direction has passed the transport roller pair, the transport motor 31 is switched to forward rotation, and the positions of the left and right front ends in the width direction of the recording medium are aligned again by the transport roller pair. After that, the operation to record an image on one side of the recording medium is performed, and the recording medium with the recorded image is ejected to the paper discharge section 8 through the paper discharge roller pair of the paper discharge roller 34 and spur 35, as shown in F3. Furthermore, outside the main scanning range for recording to the recording medium, a maintenance unit 5 is located. When no image is being recorded, the carriage 41 is positioned in a standby position on the maintenance unit and performs operations such as recovering the recording head 42.

[0017] Figure 3 is a perspective view showing the drive unit 6 of the recording device M in this embodiment. Figure 4 is a perspective view showing the drive transmission switching mechanism, including the drive transmission switching unit, in the drive transmission switching device in this embodiment. Specifically, Figure 4(a) shows the drive transmission switching mechanism after assembly, and Figure 4(b) shows the drive transmission switching mechanism before assembly.

[0018] The drive (force) generated by the transport motor 31 is transmitted to the drive unit 6 via a transport roller output gear 37 that rotates integrally with the transport roller 32. The drive unit 6 consists of a drive input gear 614 that meshes with the transport roller output gear 37, a drive base 611 and drive cover 612 that hold multiple gears that transmit drive to each driven part and various gears, and a positioning means 663 that positions the drive transmission switching part. Drive is transmitted from the drive input gear 614 to the first sun gear 631 via multiple gears. The first sun gear 631 and the second sun gear 632 are fitted to the drive shaft 635 in a D-cut shape and are configured to rotate integrally. The planetary gear 633 meshes with the second sun gear 632 and functions as a planetary gear mechanism. The planetary arm 634 that holds the planetary gear 633 is rotatable about the same axis as the drive shaft 635 and is also movable in the axial direction. Furthermore, a trigger holder 641, a trigger holder spring 642, and a drive shaft gear 643 are arranged coaxially with the drive shaft 635. The drive shaft gear 643 is fitted to the drive shaft 635 in a D-cut shape and rotates as a single unit. The trigger holder 641 is movable in the axial direction of the drive shaft 635, and the planetary arm 634 also synchronizes with the axial movement of the trigger holder 641. The drive shaft 635 is pivotally supported by the drive base 611 and the drive cover 612 and is arranged parallel to the scanning direction of the carriage 41. The drive transmission switching unit consists of a second sun gear 632, a planetary gear 633, a planetary arm 634, and a trigger holder 641. The first sun gear 631 may be held by the planetary arm 634 and included in the drive transmission switching unit. The drive switching unit is constantly biased in the -X direction by the trigger holder spring 642.

[0019] Multiple support shafts, from support shaft 1 to support shaft 3, are arranged along the orbital path of the planetary gear 633 relative to the planetary arm 634. The planetary gear 633 and planetary arm 634 have shaft holes, allowing them to be inserted into each support shaft. Multiple drive input gears are arranged to transmit drive to each drive mechanism when the planetary gear 633 and planetary arm 634 are inserted into each support shaft.

[0020] When support shaft 1 is inserted into the axial hole between planetary gear 633 and planetary arm 634, the maintenance input gear 651 and planetary gear 633 mesh together, enabling drive transmission. When support shaft 2 is inserted into the axial hole between planetary gear 633 and planetary arm 634, the second intermediate gear 621, which functions as a second paper feed input gear, meshes with planetary gear 633, enabling drive transmission. When support shaft 3 is inserted into the axial hole between planetary gear 633 and planetary arm 634, the first paper feed input gear and the first intermediate gear 15 mesh with planetary gear 633, enabling drive transmission.

[0021] Figures 5(a) and 5(b) illustrate the contact means that come into contact with the carriage during the switching operation by the drive transmission switching unit of the drive unit 6 described above. Figure 5(a) is a perspective view of the drive transmission switching contact means 648, and Figure 5(b) is a cross-sectional view of the drive transmission switching contact means 648.

[0022] As shown in Figure 5(a), the pivot 646 is positioned parallel to the scanning direction of the carriage 41 and pivotally supports the biasing member 647 and the drive transmission switching contact means 648. The drive transmission switching contact means 648 includes a first contact portion 648a that contacts the carriage 41 and a second contact portion 648b that contacts the contact surface 6411 of the trigger holder 641 by further moving the carriage 41 in the axial direction (X direction). As a result, the drive transmission switching portion is moved to a first locking position, a second locking position, a drive switching position, etc., depending on the amount of movement (pushing amount) of the carriage 41. As shown in Figure 5(b), the drive transmission switching contact means 648 is positioned to protrude from the chassis 44 and to be in a position where it can contact the contact surface 48 of the carriage 41 (contact position: solid line in Figure 5(b)). In this state, the drive transmission switching unit can be moved by moving the carriage 41 in the axial direction. Alternatively, by rotating the drive shaft 635 in a predetermined direction from the above contact position, the drive transmission switching contact means 648 can be rotated to a position where it does not contact the contact surface 48 of the carriage (retracted position: dashed line in Figure 5(b)).

[0023] Figures 6(a), 6(b), and 6(c) show the drive connection positions of the drive transmission switching section in this embodiment, with the essential parts extracted and displayed. Figures 6(aa), 6(bb), and 6(cc) are front views of the area around the positioning means 663, corresponding to Figures 6(a), 6(b), and 6(c).

[0024] The trigger holder 641 is provided with a locking portion 6412 so that the drive transmission switching unit can be locked at multiple positions relative to the axial direction of the drive shaft 635, and the drive unit 6 is provided with a positioning means 663 for locking with this locking portion 6412. The positioning means 663 includes a clutch 6632 that maintains the axial position of the drive shaft 635 by locking with the locking portion 6412. The positioning means 663 also consists of a clutch spring 6633 that biases the locking portion 6412 and the clutch 6632 so that they do not separate, and a clutch holder 6631 that holds the clutch 6632 and the clutch spring 6633.

[0025] As shown in Figures 6(a) and 6(aa), the locking portion 6412 locks into the first locking portion 6632a provided on the clutch 6632, thereby locking it in the first locking position (A). In this position, each part and the drive transmission switching unit become either in a driven-connected state or a non-driven-connected state, depending on the support shaft inserted through the shaft hole of the planetary gear 633 and the planetary arm 634. The first locking position (A) is used when driving the maintenance unit 5 and when stopping the feeding of recording media from the first paper feed unit 1 and the second paper feed unit 2.

[0026] As shown in Figures 6(b) and 6(bb), the carriage 41 displaces the drive switching unit by a predetermined amount in the axial direction, and the locking part 6412 locks in the second locking position (B) by locking with the second locking part 6632b provided on the clutch 6632. At this position, each part and the drive transmission switching unit are connected in a drive-connected state according to the support shaft inserted through the axial hole of the planetary gear 633 and the planetary arm 634. The second locking position (B) is used when connecting the drive to the first paper feeding unit 1 or the second paper feeding unit 2 and feeding paper, etc.

[0027] As shown in Figures 6(c) and 6(cc), the carriage 41 displaces the drive switching unit by a predetermined amount in the axial direction, and the locking part 6412 reaches the drive switching position 6632c. At this time, the axial holes of the planetary gear 633 and planetary arm 634 move to a position where they are completely disengaged from the support shaft. Then the planetary arm 634 becomes capable of orbiting, that is, moving toward each support shaft, and the drive switching operation becomes possible. When the carriage 41 retracts, the biasing force of the trigger holder spring 642 causes the drive switching unit to start moving in the -X direction, and it passes through 6632d, which consists of multiple curved surfaces, due to the inclined surface provided at the drive switching position 6632c. Then the locking part 6412 returns to the first locking position relative to the first locking part 6632a. As described above, the drive transmission switching unit of the drive unit 6 is configured as described above.

[0028] <Drive transmission switching operation> The drive transmission switching operation in this embodiment will be described below with reference to Figures 7 to 9. Figures 7 to 9 show the drive transmission switching operation for the three support shafts 1 to 3.

[0029] Figure 7 is a perspective view and a schematic cross-sectional view showing the first drive transmission switching operation in this embodiment, illustrating the drive transmission switching operation with respect to the support shaft 1.

[0030] Figure 7(a) shows the planetary arm 634 pushed to position A on the support shaft 1, and the planetary gear 633 is positioned at position A1, which corresponds to position A. The planetary gear 633 meshes with the second sun gear 632 and also with the maintenance input gear 651, so it can transmit drive (force). Figure 7(b) shows the planetary arm 634 pushed to position B on the support shaft 1, and the planetary gear 633 is positioned at position B1, which corresponds to position B. The planetary gear 633 meshes with the second sun gear 632 and also with the second intermediate gear 621, so it can transmit drive (force) between the second sun gear 632 and the second intermediate gear 621. Figure 7(c) shows the planetary arm 634 pushed to position C on the support shaft 1, and the planetary gear 633 is positioned at position C1, which corresponds to position C. The planetary gear 633 itself is in position C1 and is therefore not meshing with the second solar gear 632, and is in a position / state where it is not meshing with any of the drive input gears.

[0031] Figure 8 is a perspective view and a schematic cross-sectional view showing the second drive transmission switching operation in this embodiment, illustrating the drive transmission switching operation with respect to the support shaft 2.

[0032] Figure 8(a) shows the planetary arm 634 pushed to position C on the support shaft 2. From the state shown in Figure 7(c), the planetary arm 634 rotates, allowing the planetary gear 633 to be positioned at position C2, which corresponds to position C. At this time, the planetary gear 633 itself is not meshed with the second sun gear 632 and is in a position where it is not meshing with any gear. Figure 8(b) shows the planetary arm 634 pushed to position B on the support shaft 2, and the planetary gear 633 is positioned at position B2, which corresponds to position B. The planetary gear 633 meshes with the second sun gear 632 and also with the second intermediate gear 621, so it can transmit drive (force) between the second sun gear 632 and the second intermediate gear 621. In other words, although the position of the planetary gear 633 is different at both positions B1 and B2, it is configured to transmit drive (force) to the same second intermediate gear 621. Figure 8(c) shows the planetary arm 634 pushed to position A on the support shaft 2, with the planetary gear 633 positioned at position A2, which corresponds to position A. At this time, the planetary gear 633 is meshed with the second sun gear 632, but not with any other drive input gears. With this configuration, even when it is desired to cut without transmitting drive (force) to the second intermediate gear 621, the drive transmission switching operation can be performed quickly.

[0033] Figure 9 is a perspective view and a schematic cross-sectional view showing the third drive transmission switching operation in this embodiment, illustrating the drive transmission switching operation with respect to the support shaft 3.

[0034] Figure 9(a) shows the planetary arm 634 pushed to position C on the support shaft 3. From the state shown in Figure 7(c) or Figure 8(a), the planetary arm 634 rotates, allowing the planetary gear 633 to be positioned at position C3, which corresponds to position C. At this time, the planetary gear 633 itself is not meshed with the second sun gear 632 and is in a position where it is not meshed with any gear. Figure 9(b) shows the planetary arm 634 pushed to position B on the support shaft 3, and the planetary gear 633 is positioned at position B3, which corresponds to position B. The planetary gear 633 meshes with the second sun gear 632 and also with the first intermediate gear 15, so it can transmit drive (force) between the second sun gear 632 and the first intermediate gear 15. Figure 9(c) shows the planetary arm 634 pushed to position A on the support shaft 3, with the planetary gear 633 positioned at position A3, which corresponds to position A. At this time, the planetary gear 633 is meshed with the second sun gear 632, but not with any other drive input gears. With this configuration, even when it is desired to cut without transmitting drive (force) to the first intermediate gear 15, the drive transmission switching operation can be performed quickly.

[0035] With the configuration described above, if you want to start paper feeding immediately from the standby state, the position of the planetary gear 633 can be changed from the standby position A1 to position A2, which connects the drive to the second paper feeding unit 2, allowing for a smooth drive switching operation. Also, if you want to disconnect the drive transmission to the second paper feeding unit, you can smoothly switch the drive from position B2 on the support shaft 2 to position C2, as shown in Figure 8. Note that the aforementioned "standby position" is the position where the drive can be connected to the maintenance unit 5.

[0036] In the aforementioned case, the driving force was transmitted via the second intermediate gear 621 on two axes, the rotation of the planetary arm 634 was restricted by three axes (support axes 1-3), and the drive was switched by displacing it to three positions A, B, and C in the axial direction. However, this embodiment is not limited to this configuration. For example, the drive (force) may be transmitted via the first intermediate gear 15 instead of the second intermediate gear 621, and the number of driven axes (support axes) in the rotational direction of the planetary arm may be increased as long as space for the components can be secured. The number of positions in the axial direction may also be increased. In this way, it is possible to increase the number of mechanisms to which the rotational driving force is transmitted in the drive transmission switching mechanism as needed.

[0037] <First embodiment of the drive switching unit> Figure 10 is a perspective view showing the drive switching unit in the first embodiment to which this embodiment is applied. Figure 10(a) shows the drive switching unit after assembly, and Figure 10(b) shows the drive switching unit before assembly. The second sun gear 632 is assembled onto the guide shaft 634a provided on the planetary arm 634, and then the planetary gear 633 is assembled onto the fitting shaft 634b. A retaining portion 634c is provided on a part of the fitting shaft 634b to prevent the planetary gear 633 from coming off the planetary arm 634. When the drive switching unit moves the drive shaft 635 in the axial direction, it is necessary to pass through the gap between the teeth of the input gear of each drive means and the planetary gear 633, as shown in Figure 4. Since the meshing angle between the input gear of the drive unit and the planetary gear 633 is different on each support shaft, it is better to provide about two retaining portions 634c to prevent the planetary gear 633 from coming off the planetary arm 634. Furthermore, it is desirable that the latching portion 634c be shaped like a hook so that it bites more firmly into the planetary arm when the latching portion 634c is moved away from the planetary arm 634.

[0038] The flange 632a on the second sun gear 632 is restricted in the axial direction of the drive shaft 635 by the side of the planetary gear 633, so that the second sun gear 632 does not detach from the guide shaft 634a on the planetary arm 634. As a result, the second sun gear 632 and the planetary gear 633 are held by the planetary arm 634.

[0039] Figure 11 shows the state when the drive switching unit is moved in the axial direction, and is a comparison diagram of the conventional configuration and the configuration in the first embodiment.

[0040] Figures 11(a) and 11(b) show the positions between the drive unit and the drive switching unit for selecting whether to connect or disconnect the drive. Figure 11(c) shows the case where the planetary gear is positioned at position C, which is the position in which the planetary arm can rotate.

[0041] For each driving mechanism, it is possible to select whether to connect or disconnect the drive between the drive switching unit and the drive unit at either position A or position B.

[0042] In the conventional configuration, as shown in the upper part of Figures 11(a) to (c), the second sun gear 632 is fixed in the axial direction of the drive shaft 635. The planetary gear 633 is hooked onto the planetary arm 634, and the planetary gear 633, planetary arm 634, and trigger holder 641 move in the axial direction of the drive shaft 635 by a moving mechanism (not shown).

[0043] In this embodiment, as shown in the lower part of Figures 11(a) to (c), the drive switching unit, which consists of the second sun gear 632, planetary gear 633, planetary arm 634, and trigger holder 641, is movable in the axial direction of the drive shaft 635. In this configuration, when the planetary gear 633 moves to position C, as shown in Figure 10(a), the skein teeth portion 634d of the planetary arm 634 and the skein teeth portion 643a of the drive shaft gear 643 mesh. As a result, the planetary arm 634 can revolve around the drive shaft 635 by the drive shaft gear 643, which rotates integrally with the drive shaft 635, and thus can move to a predetermined support shaft.

[0044] In conventional configurations, the planetary arm 634 is configured to retract the second sun gear 632 in the axial direction of the drive shaft 635. On the other hand, in this embodiment, the amount of meshing between the second sun gear 632 and the planetary gear 633 is always the same, and there is no need to provide a bent shape in the planetary arm 634 to avoid the second sun gear 632. Therefore, it is possible to shorten the width of the drive switching section by the amount of the bent shape of the planetary arm 634, and consequently, to reduce the width of the recording device. Accordingly, the constraints on the installation location when a user installs the recording device are alleviated.

[0045] <Second embodiment of the drive switching unit> Figure 12 is a diagram illustrating the shape of the drive switching section in a second embodiment to which this embodiment is applied.

[0046] Figure 12(a) is a perspective view of the drive switching section, showing a state where the planetary gear 633 does not properly engage with the tip of the fixed shaft even when the drive source is operated by a predetermined amount at the aforementioned position C. Figure 12(b) is a cross-sectional view of the drive switching section, showing a cross-sectional view of the main part in Figure 12(a). In this state, the planetary gear 633 is held at position C, and when the drive switching operation is performed from support shaft 1 to support shaft 3, it rotates by a predetermined drive switching amount, but due to some influence, the actual value of the amount of rotation is less than the theoretical value, and the rotation stops between support shaft 2 and support shaft 3. In this case, after the drive switching operation, it is determined whether or not the planetary gear has entered support shaft 3, and the drive switching operation is completed. After that, the planetary arm 634 moves from position C to position A or position B, so it is no longer engaged with the locking part provided on the clutch 6632. Therefore, the trigger holder spring 642 biases the planetary gear 633 in the -X direction, causing it to be sandwiched between the planetary arm 634 and shaft 2 (or shaft 3) on the X axis. In this state, the support shaft 3 is not inserted into the shaft hole of the planetary gear, so no drive is transmitted to the drive target of the support 3.

[0047] In the conventional configuration, since the intended drive target does not move, the drive switching failure is only determined based on the result of a judgment using the output of a sensor (specifically, the photointerrupter sensor 666 in Figure 16(a)) provided on the drive target. In contrast, in this embodiment, as shown in Figure 12(a), a notch shape 6332 is provided in the sleeve portion 6331 of the planetary gear 633. Furthermore, when the drive is rotated after the drive switching operation is completed, the direction of rotation of the drive coincides with the direction in which the planetary arm is rotated from the support shaft 1 to the support shaft 3. Therefore, the rotation of the drive prevents the notch shape 6332 from catching on the shaft tip of the support shaft 3, allowing a transition from the state shown in Figures 12(a) and 12(b) to the state shown in Figures 12(c) and 12(d). In other words, even if the drive switching fails, the subsequent rotation of the drive can compensate for the insufficient amount of rotation, and the drive can be transmitted to the drive target.

[0048] The structure described above allows the drive transmission switching operation to be completed stably without any interruptions, thus enabling reliable drive transmission switching.

[0049] Figure 13 is a block diagram of the recording device M in this embodiment. The MPU 901 controls the operation of each part and the processing of data. The processing controlled by the MPU 901 includes the processing described later in Figures 14 and 15. The ROM 902 stores programs and data executed by the MPU 901. The RAM 903 temporarily stores processing data executed by the MPU 901 and data received from the host computer 906. The recording head 42 is controlled by the recording head driver 942. The carriage 41 is driven by the carriage motor 43, and the carriage motor 43 is controlled by the carriage motor driver 943. The transport roller 32 and the paper discharge roller 34 are driven by the transport motor 31, and the transport motor 31 is controlled by the transport motor driver 931. The host computer 906 has a printer driver 9061 installed for processing recording information such as the recorded image and image quality and communicating with the recording device M when the user commands the execution of a recording operation. The MPU 901 exchanges recorded images and other data (sending and receiving data) with the host computer 906 via the I / F unit 905. The operation display unit 904 is a unit for receiving operations from the user and presenting information to the user, and is composed of, for example, an LCD operation panel.

[0050] <Detection process for abnormal drive switching behavior> The drive switching abnormal behavior detection process in this embodiment will be described below with reference to Figure 14. Figure 14 is a flowchart of the drive switching abnormal behavior detection process.

[0051] In step S1401, the MPU 901 receives a paper feed command. The paper feed command received in this step may be a paper feed command based on printing via communication with the host computer 906 through the I / F unit 905, or a paper feed command based on printing image data stored in the ROM 902, but the source of the paper feed command is not specified in this step. Hereafter, "step S~" will be abbreviated as "S~".

[0052] In S1402, the MPU901 rotates the transport motor 31 based on the paper feed command received in S1401.

[0053] In S1403, the MPU901 determines whether a mechanism that should not be connected to a drive has moved. Specifically, for example, suppose that although a drive connection has been made to the first paper feed unit 1, the photo interrupter sensor 666 (see Figure 16(a)) which is linked to the maintenance unit 5 has reacted (i.e., the photo interrupter sensor 666 has detected an output value above a predetermined threshold). In such a case, this step determines YES (drive connection state (transmission state) with a mechanism that should not be connected to a drive). The conditions used in this step may also be applied to relationships other than the one between the first paper feed unit 1 and the maintenance unit 5 described above. If the result of this step is YES, the process proceeds to S1404. On the other hand, if the result of this step is NO, the drive switching abnormal behavior detection process is terminated. Note that the sensor used in this step is not limited to the photo interrupter sensor. Any sensor capable of detecting whether the drive force from the drive source is being transmitted or not can be used. Furthermore, in this step, any value greater than zero can be adopted as a predetermined threshold for comparison with the output value of the photointerrupter sensor. In addition, although the case in this example shows the sensor being located in the maintenance unit 5, the sensor may also be located in the first paper feed unit 1. In this case, if the output value of the sensor linked to the first paper feed unit 1 indicates a non-transmission state despite the drive being switched to connect to the first paper feed unit 1, it will be determined in this step that the drive switching has failed.

[0054] In S1404, the MPU901 performs a process to correct the amount of movement required for drive switching. This process is called the switching movement amount correction process. The specific details of the switching movement amount correction process will be explained using Figure 15.

[0055] <Switching operation amount correction processing> The switching operation amount correction process (S1404 in Figure 14) in this embodiment will be explained below with reference to Figure 15. Figure 15 is a flowchart of the switching operation amount correction process.

[0056] In S1501, the MPU901 corrects (increases in this example) the switching amount. Specifically, it derives a correction value to correct the switching amount, corrects the switching amount by adding the derived correction value, and overwrites the ROM902 with the derived correction value (or the corrected switching amount). The correction value derived in this step may be a value that is changed in stages. For example, initially, the switching amount may be corrected with a small correction value, and if the drive switching is still not performed properly even with the corrected switching amount, the correction value may be increased in stages, and it may be determined whether the drive switching was performed properly each time a correction is made. Furthermore, the amount of movement to be corrected in this step is assumed to be the amount of movement required for the planetary gear 633 (see Figure 7) to move from support shaft 1 to support shaft 2, and the amount of movement required to move from support shaft 1 to support shaft 3. Note that the combination of axes before and after movement is arbitrary and not limited.

[0057] In S1502, the MPU 901 determines whether the correction value stored in the ROM 902 exceeds a predetermined threshold. If the result of this step is YES, it indicates that the switching operation amount during drive switching has become too large, and the process proceeds to S1503. On the other hand, if the result of this step is NO, the switching operation amount correction process is terminated.

[0058] In step S1503, the MPU 901 performs error handling. Specifically, it displays an error notification screen on the operation display unit 904 and stops the paper feeding operation. This step may occur if the correction value stored in the ROM 902 (i.e., the corrected switching operation amount) is too large, causing the planetary gear 633 to take too long to move from support shaft 1 to support shaft 2. In such a case, it would be detrimental to the user, so the error display in this step informs the user that there is an abnormality. Upon seeing the error display, the user will likely take some action, such as contacting the support center, to have the drive switching unit replaced.

[0059] In the case described above, the method of increasing the operating amount as the operating amount correction for S1501 was explained, but this embodiment is not limited to the method of increasing the operating amount. Depending on the configuration of the drive switching unit, this embodiment can also be applied to cases where the operating amount is decreased as the operating amount correction for S1501.

[0060] Furthermore, in the aforementioned case, a determination of magnitude was made using a predetermined threshold for the overwritten correction value, but this embodiment is not limited to this form. For example, this embodiment can also be applied to cases where the corrected operation amount is overwritten and stored in ROM instead of the correction value, and a determination of magnitude is made using a predetermined threshold for the overwritten and stored operation amount.

[0061] <Problems of this embodiment> The problems of this embodiment will be explained below with reference to Figures 16 and 17. Figure 16(a) is a perspective view of the assembled drive transmission switching mechanism in this embodiment. Figure 16(b) is a cross-sectional view of the downstream configuration of the drive transmission in relation to the drive transmission switching mechanism shown in Figure 16(a), representing a standard (ideal) configuration in which all parts have a center value. In contrast, Figures 17(a) and 17(b) are diagrams for comparison with Figure 16(b), showing cross-sectional views of the state when the shaft diameter is at the minimum value of the tolerance range and the hole diameter is at the maximum value of the tolerance range due to tolerance variation.

[0062] This embodiment addresses problems that may arise, for example, when the gap between the diameter of a hole and the diameter of the shaft inserted into that hole is larger than the ideal value due to individual differences, or when inexpensive, easily wearable parts are used and deteriorate over time. In other words, in the configuration shown in Figure 16, when the upstream gear starts to rotate, the transmission gear moves in the direction of the load before starting to rotate, so the transmission gear does not rotate immediately after the upstream gear starts to rotate. Here, as shown in Figures 17(a) and 17(b), as a result of the reduced shaft diameter of the transmission gear, the amount of drive switching operation required before the downstream gear starts to rotate becomes larger compared to Figure 16(b). This embodiment addresses these problems.

[0063] <Effects of this embodiment> The effects of this embodiment will be explained below using Figure 18. Figure 18 is an explanatory diagram of the effects of this embodiment. The horizontal axis shows the sampling data, and the vertical axis shows the number of drive slits of the transport motor 31. The first switching operation amount shown in Figure 18 is the value when all parts are manufactured according to the center value, and represents the center value of the drive switchable range. This first switching operation amount is a theoretical value that can be calculated in advance. Furthermore, the switching operation amount referred to here is the drive amount for rotating the planetary gear 633.

[0064] Due to variations in component tolerances, the range of the amount of movement that can be switched between drives differs from one individual to another. In this embodiment, the drive switching unit is designed so that the drive can be switched by applying a theoretical value, the first switching amount. However, for example, if individual unit B is used beyond its product life or manufactured using inexpensive, easily wearable materials, switching becomes impossible even if the first switching amount is applied (individual unit B_after excessive durability in the figure).

[0065] In this embodiment, if a first switching operation amount is applied but it is detected that a drive connection could not be made to the drive destination corresponding to the first switching operation amount, a second switching operation amount greater than the first switching operation amount is applied to the drive switching unit. As a result, even if a component has deteriorated over time, as shown in "Individual B_After Excessive Durability" in Figure 18, for example, drive switching becomes possible. Therefore, according to this embodiment, the product life is extended and the cost of the product is reduced because designers can select inexpensive materials when manufacturing components.

[0066] As described above, this embodiment performs a drive switching abnormal behavior detection process that includes a switching operation amount correction process. This makes it possible to realize a highly durable and time-efficient drive switching sequence at low cost.

[0067] <Example of a first drive switching configuration to which this embodiment can be applied> Hereinafter, a first drive switching configuration example (configuration of Patent Document 2) to which this embodiment can be applied will be described with reference to Figure 19. Figure 19 is an explanatory diagram of the switching operation of the power transmission switching mechanism when the contact portion 84a of the switching lever 84 in this example is located at lever position PS3.

[0068] As shown in Figures 19(a) and 19(b), the carriage 41 moves back and forth in the main scanning direction (in the direction of arrows E and F). A plate-shaped guide block 87 is positioned above the switching lever 84. A guide regulating body 88 is drilled into the guide block 87 and consists of a roughly L-shaped groove. This guide regulating body 88 has a regulating portion 88a that is longer in the main scanning direction and a guide portion 88b that is longer in the sub-scanning direction. The tip of the contact portion 84a of the switching lever 84 is slidable through the guide regulating body 88 in the vertical direction.

[0069] As shown in Figure 19(b), the transmission shaft 91 of the power transmission unit 90 is supported on the right side of the side plate 11c so as to be parallel to the axis of the support shaft 89 and is positioned below the support shaft 89. The paper feed transmission gear 92 is rotatably mounted at a predetermined position on the transmission shaft 91. The maintenance transmission gear 93 is also rotatably mounted on the transmission shaft 91 so as to be positioned at a predetermined position to the right of the paper feed transmission gear 92. The switching gear 83 is configured to selectively mesh with the paper feed transmission gear 92 and the maintenance transmission gear 93. The paper feed transmission gear 92 is connected to the drive shaft via a known transmission mechanism, and the maintenance transmission gear 93 is connected to the drive unit of the maintenance mechanism via a known transmission mechanism. This drive unit is, for example, a drive mechanism that opens and closes a suction pump or intake port.

[0070] The first biasing spring 86a is inserted into the pivot shaft 89 so as to be located to the right of the switching lever 84. The right end of the first biasing spring 86a is locked to the maintenance frame 64 of the maintenance mechanism. The second biasing spring 86b is inserted into the pivot shaft 89 so as to be located to the left of the switching gear 83. The left end of the second biasing spring 86b is locked to the side plate 11c. The biasing force of the second biasing spring 86b is set to be less than that of the first biasing spring 86a. Both the first biasing spring 86a and the second biasing spring 86b are made of coil springs. A friction pad 85 is provided between the switching gear 83 and the switching lever 84 to transmit the rotation of the switching gear 83 to the switching lever 84.

[0071] When the LF motor rotates in the forward direction, as shown in Figure 19(a), the contact portion 84a of the switching lever 84 is held at lever position PS3 instead of lever position PS2. When the contact portion 84a is at lever position PS3, it is located outside the movement path of the carriage 41, so the carriage 41 and the contact portion 84a do not come into contact during image recording. Therefore, even if the switching lever 84 is positioned within the image recording operation range, it does not interfere with the image recording operation.

[0072] As explained above, Patent Document 2 discloses a recording device in which the carriage and the switching lever do not come into contact by incorporating a mechanism that allows the drive switching lever to be housed. However, Patent Document 2 does not take into account variations in motor rotation amount due to individual differences in LF motors or deterioration of parts over time. If the rotation amount of the LF motor is set taking these factors into account, the switching operation amount will uniformly increase, and the switching operation will take a long time.

[0073] Therefore, it is conceivable to apply this embodiment to the configuration of Patent Document 2. In other words, by focusing on the fact that the amount of LF rotation required to extend the switching lever 84 remains unchanged, this embodiment can be applied by configuring the system to have a sensor or the like downstream of the maintenance transmission gear. For example, it is conceivable to further include a load fluctuation detection means (sensor, etc.) for detecting load fluctuations in the switching means, and determine that the drive switching from the first driven unit to the second driven unit has not been completed when the output value of this load fluctuation detection means is below a predetermined threshold.

[0074] By applying this embodiment to the configuration of Patent Document 2, the rotation amount of the LF motor can be corrected according to individual circumstances such as individual differences and deterioration over time. Therefore, it becomes possible to optimize the switching operation amount and suppress the increase in switching operation time. The switching operation amount referred to here includes the amount of drive required to extend the drive switching lever and the amount of drive required to press the drive switching lever with the carriage mechanism.

[0075] <Second drive switching configuration example to which this embodiment can be applied> Below, a second drive switching configuration example (configuration described in Patent Document 3), to which this embodiment can be applied, will be explained using Figure 20. Figure 20 is a diagram showing the operation of the PG adjustment motor during platen gap (hereinafter referred to as PG) switching. Here, the upper vertical axis represents the amount of PG. The lower vertical axis represents the operation items. On the other hand, the horizontal axis represents the rotation amount of the PG adjustment motor.

[0076] As shown in Figure 20, the amount of PG can be switched by rotating the PG adjustment motor in the forward and reverse directions. Specifically, as shown in the figure, the amount of PG can be switched by moving the position of the recording head between the first position and the fourth position (Posi.1 to Posi.4 in the figure).

[0077] When the recording device is powered on, the control unit first calculates the amount of backlash of the power transmission means, such as the first gear of the PG adjustment means. Specifically, as shown in the "Correction Amount Calculation" vertical axis at the bottom of Figure 20, the control unit reverses the PG adjustment motor to bring the gear projection of the first gear into contact with the first contact point on the base side.

[0078] Subsequently, the PG adjustment motor is driven in the forward direction, causing the gear projection to strike the second contact point on the base. The backlash amount is calculated from the difference between the theoretical value of the amount of rotation of the PG adjustment motor required for the rotation of the first gear at this time and the actual value of the amount of rotation of the PG adjustment motor measured by an encoder scale and encoder sensor, which are examples of motion amount measurement means. Then, when the control unit switches the PG amount, it adds the calculated backlash amount as a correction value and drives the PG adjustment motor.

[0079] As explained above, Patent Document 3 discloses a technique in which a carriage is brought against both ends, the distance between the two ends is measured, and the amount of movement required for switching is selected based on the measured distance. However, this required the carriage to be moved from one end to the other. This movement time was long, which led to a problem of reduced user experience.

[0080] By applying this embodiment to the configuration of Patent Document 3, the operation time can be shortened because it is no longer necessary to perform the action of abutting the carriage against both ends. Consequently, the user experience is improved.

[0081] [Other embodiments] In the embodiments described above, the driven target of the driven unit was described as the first paper feed unit, the second paper feed unit, or the maintenance unit. However, this embodiment can also be applied to cases where there is no driven target for the driven unit.

[0082] This disclosure can also be implemented by supplying a program that implements one or more of the functions of the above-described embodiments to a system or device via a network or storage medium, and by having one or more processors in the computer of that system or device read and execute the program. It can also be implemented by a circuit (e.g., an ASIC) that implements one or more functions.

[0083] [Technical Features of This Disclosure] This disclosure includes the following components: (Configuration 1) A drive switching device comprising: a drive source; a driven part that is driven by a driving force generated by the drive source, and includes at least a first driven part and a second driven part that are selectively driven by drive switching; a transmission means for transmitting the driving force to the driven part; a switching means for performing a drive switch from the first driven part to the second driven part when a first switching operation amount is applied to the switching means; and a control unit that corrects the switching operation amount applied to the switching means from the first switching operation amount to the second switching operation amount when the drive switch from the first driven part to the second driven part has not been performed when the first switching operation amount is applied to the switching means. (Configuration 2) The drive switching device according to Configuration 1, further comprising detection means provided in the first driven unit or the second driven unit for detecting whether the driving force from the drive source is being transmitted or whether the driving force is not being transmitted. (Configuration 3) The drive switching device according to Configuration 1 or 2, further comprising a first determination means that determines whether or not to perform a switching operation amount correction from the first switching operation amount to the second switching operation amount, based on the result of detection by the detection means. (Configuration 4) The drive switching device according to any one of Configurations 1 to 3, characterized in that the detection means is a sensor provided on the first driven part. (Configuration 5) A drive switching device according to any one of Configurations 1 to 4, characterized in that when the output value of the sensor is greater than or equal to a predetermined threshold, it is determined that the drive switching from the first driven unit to the second driven unit has not been performed. (Configuration 6) The drive switching device according to any one of Configurations 1 to 5, characterized in that the second switching operation amount is greater than the first switching operation amount. (Configuration 7) A drive switching device according to any one of Configurations 1 to 6, characterized in that a correction value for correcting the first switching operation amount to the second switching operation amount is increased in stages. (Configuration 8) The drive switching device according to any one of Configurations 1 to 7, characterized in that the first driven unit and the second driven unit are each arranged in positions with different rotation directions of the sun gear. (Configuration 9) A drive switching device according to any one of Configurations 1 to 8, characterized in that the first driven unit and the second driven unit are each arranged at different positions in the axial direction of the drive shaft. (Configuration 10) A drive switching device according to any one of Configurations 1 to 9, characterized in that there is no drive target for either the first driven unit or the second driven unit. (Configuration 11) A drive switching device according to any one of Configurations 1 to 10, further comprising a load fluctuation detection means for detecting load fluctuations in the switching means, wherein it is determined that drive switching from the first driven unit to the second driven unit has not been performed when the output value of the load fluctuation detection means is less than or equal to a predetermined threshold. (Configuration 12) An image recording device having a drive switching device as described in any one of Configurations 1 to 11, wherein the first driven unit is configured to include a maintenance unit, and the second driven unit is configured to include a paper feeding unit. (Configuration 13) The image recording device according to Configuration 12, characterized in that the first switching operation amount is provided by a transport motor, and the first switching operation amount is the value of the number of drive slits of the transport motor. (Control method for drive switching device) A control method for a drive switching device comprising: a drive source; a driven part driven by a driving force generated by the drive source, the driven part including at least a first driven part and a second driven part that are selectively driven by drive switching; a transmission means for transmitting the driving force to the driven part; a switching means for performing a drive switching from the first driven part to the second driven part when a first switching operation amount is applied to the switching means; and a control unit, wherein if the drive switching from the first driven part to the second driven part has not been performed when the first switching operation amount is applied to the switching means, the control unit corrects the switching operation amount applied to the switching means from the first switching operation amount to the second switching operation amount. A program for causing a computer to execute a control method for a drive switching device, the device comprising: a drive source; a driven part driven by a driving force generated by the drive source, the driven part including at least a first driven part and a second driven part that are selectively driven by drive switching; a transmission means for transmitting the driving force to the driven part; a switching means for performing a drive switching from the first driven part to the second driven part when a first switching operation amount is applied to the switching means, wherein the control unit has a step of correcting the switching operation amount applied to the switching means from the first switching operation amount to the second switching operation amount when the drive switching from the first driven part to the second driven part has not been performed when the first switching operation amount is applied to the switching means. [Explanation of symbols]

[0084] 1. First paper feed section 5. Maintenance Department 6 Drive Unit 31. Transport motor 901 MPU

Claims

1. Power source and A driven part that is driven by the driving force generated by the drive source, and the driven part includes at least a first driven part and a second driven part that are selectively driven by drive switching, A transmission means for transmitting the driving force to the driven part, A switching means that performs a drive switch from the first driven unit to the second driven unit by applying a first switching operation amount, When the first switching operation amount is applied to the switching means, if the drive switching from the first driven unit to the second driven unit has not been completed, a control unit corrects the switching operation amount applied to the switching means from the first switching operation amount to the second switching operation amount, A drive switching device characterized by having the following features.

2. The first driven unit or the second driven unit further comprises detection means for detecting whether the driving force from the drive source is being transmitted or whether the driving force is not being transmitted. The drive switching device according to feature 1.

3. The system further includes a first determination means that determines whether or not to perform a switching operation amount correction from the first switching operation amount to the second switching operation amount, based on the result of detection by the detection means. The drive switching device according to feature 2.

4. The detection means is a sensor provided in the first driven unit. The drive switching device according to feature 3.

5. If the output value of the sensor is greater than or equal to a predetermined threshold, it is determined that the drive switching from the first driven unit to the second driven unit has not been performed. The drive switching device according to feature 4.

6. The second switching amount is greater than the first switching amount. The drive switching device according to feature 5.

7. The correction value for correcting the first switching operation amount to the second switching operation amount is increased in stages. The drive switching device according to feature 6.

8. The first driven part and the second driven part are each positioned in different directions of rotation of the sun gear. The drive switching device according to feature 7.

9. The first driven part and the second driven part are each positioned at different axial positions on the drive shaft. The drive switching device according to feature 8.

10. There is no drive target for either the first driven part or the second driven part. The drive switching device according to feature 9.

11. The switching means further includes a load fluctuation detection means for detecting load fluctuations, If the output value of the load fluctuation detection means is below a predetermined threshold, it is determined that the drive switching from the first driven unit to the second driven unit has not been performed. The drive switching device according to feature 10.

12. Having a drive switching device according to any one of claims 1 to 11, The first driven unit is configured to include a maintenance unit, The second driven unit is configured to include a paper feeding unit. Image recording device.

13. The first switching operation amount is provided by the transport motor, The first switching operation amount is the value of the number of drive slits of the transport motor. The image recording device according to feature 12.

14. Power source and A driven part that is driven by the driving force generated by the drive source, and the driven part includes at least a first driven part and a second driven part that are selectively driven by drive switching, A transmission means for transmitting the driving force to the driven part, A switching means that performs a drive switch from the first driven unit to the second driven unit by applying a first switching operation amount, Control unit and A control method for a drive switching device having, When the first switching operation amount is applied to the switching means, if the drive switching from the first driven unit to the second driven unit has not been completed, the control unit has the step of correcting the switching operation amount applied to the switching means from the first switching operation amount to the second switching operation amount. A control method characterized by the following:

15. A program for causing a computer to execute the control method described in claim 14.

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