Flow path switching device and ink-jet printing equipment

Abstract

The utility model belongs to the technical field of ink-jet printing, and provides a flow path switching device and ink-jet printing equipment, aiming at overcoming the defects of high cost and low reliability of synchronous opening and closing of flow paths in the prior art, the flow path switching device comprises an elastic hose, a flow path is formed in the elastic hose to allow liquid to flow; the supporting mechanism is used for supporting the hose; an opening / closing mechanism that is displaced between a closed position in which the hose supported by the support mechanism is pressed to cut off a flow path in the hose, and an open position in which the hose is no longer pressed to release the cut-off by the restoring force of the hose; and the limiting mechanism is used for limiting the displacement of the switching mechanism. The flow path switching device and the ink-jet printing equipment have the advantages that the cost is low, and the reliability of the synchronous switching of each flow path is high.

Description

Technical Field

[0001] This utility model relates to the field of inkjet printing technology, and in particular to flow path switching devices and inkjet printing equipment. Background Technology

[0002] Inkjet printing technology refers to the process of spraying ink onto a printing medium through nozzles on a printhead to obtain images or text. With the rapid development of inkjet technology, its application in both home and commercial settings is becoming increasingly widespread. For example, in commercial inkjet printers, to supply ink to the printhead, especially for multi-color inks, multiple ink tubes are needed to guide each color of ink to the printhead. When the printhead is not in operation, each flow path of each ink tube should be opened synchronously to supply ink to the printhead simultaneously. Conversely, when the printhead is not in operation, each flow path of each ink tube should be closed synchronously to prevent simultaneous ink supply. Existing inkjet printers use individual clamp valves, but these typically only control a small number of ink tube flow paths. Using multiple clamp valves is not only costly but also prone to asynchronous clamping, making it difficult to ensure that each flow path is opened or closed synchronously. Furthermore, the clamping force of the clamp valves is difficult to adjust, which can easily damage the tubing. Therefore, the use of clamp valves results in low reliability of synchronous switching of each flow path.

[0003] Therefore, there is an urgent need to provide a low-cost flow path switching device and inkjet printing equipment that offers high reliability for synchronous switching of each flow path. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies, such as high cost and low reliability of synchronous switching of various flow paths. To achieve one objective of this invention, a flow path switching device is provided, comprising: an elastic hose forming a flow path for liquid flow; a support mechanism supporting the hose; a switching mechanism displaceable between a closed position and an open position, wherein in the closed position, the flow path within the hose is cut off by squeezing the hose supported on the support mechanism, and in the open position, the hose is no longer squeezed, and the cut-off is released by the restoring force of the hose; and a limiting mechanism for limiting the displacement formed by the switching mechanism.

[0005] Furthermore, the switching mechanism includes an eccentric drive assembly and a pressing assembly. The eccentric drive assembly includes a drive motor and an eccentric column that are connected by transmission. The pressing assembly includes a transmission block and a wedge block. The eccentric column presses against the transmission block. The free end of the wedge block is provided with a wedge-shaped part with rounded corners. Under the rotation of the eccentric column, the wedge-shaped part moves toward the direction of approaching and pressing the hose or moves away from the hose so that the hose is not pressed.

[0006] Furthermore, the drive motor is connected to the eccentric column via a sprocket, synchronous pulley belt, or gear set, and the drive motor is set as a stepper motor.

[0007] Furthermore, the limiting mechanism includes a limiting block and an elastic element. The limiting block is provided with a limiting groove and a through groove. The wedge block can move up and down relative to each other in the through groove. The transmission block includes a connected transmission plate and a limiting platform. The elastic element is elastically compressed and arranged between the limiting groove and the limiting platform. The elastic element applies an elastic restoring force to the limiting platform to maintain the pressure of the eccentric column's cylindrical surface against the transmission plate. The transmission plate receives the pressure force during the rotation of the eccentric column and moves up and down, thereby correspondingly causing the compression of the elastic element to decrease or increase. When the eccentric column rotates so that the wedge part corresponds to the closed position and moves in the direction of squeezing the hose, the elastic element is further compressed by the limiting platform, thereby increasing the compression and the elastic restoring force. When the eccentric column rotates so that the wedge part corresponds to the open position and moves in the direction of removing the squeezing of the hose, the elastic element releases the elastic restoring force to apply a force away from the limiting groove to the limiting platform, thereby decreasing the compression and the elastic restoring force.

[0008] Furthermore, the projection of the transmission plate on the horizontal plane is cross-shaped. The wedge block is connected to the transverse center line of the transmission plate and extends in a direction perpendicular to the transmission plate. The limiting platform is set as a pair located below the transmission plate. The pair of limiting platforms extend relatively vertically away from each other on both sides of the wedge block and are symmetrical with respect to a vertical center line of the transmission plate. The limiting groove is set as a pair. The pair of limiting grooves extend relatively vertically away from each other on both sides of the through groove and are symmetrical with respect to the center line of the through groove. The elastic element is set as a pair. An elastic element is arranged between the paired limiting platforms and limiting grooves.

[0009] Furthermore, the limiting platform and the limiting groove are arranged in pairs. The limiting platform and the limiting block corresponding to the limiting groove are respectively provided with threaded countersunk holes and threaded through holes that pass through the transmission plate. The screw of a bolt passes through the threaded countersunk hole, the elastic element and the threaded through hole in sequence and is threadedly fixed. The screw guides the displacement of the transmission block relative to the limiting block away from or near it. The head of the bolt cooperates with the threaded countersunk hole to limit the maximum displacement of the transmission block away from the limiting block. The elastic element is sleeved on the outer periphery of the screw and is compressed and deformed along the axial direction of the screw.

[0010] Furthermore, the switching mechanism also includes a pair of support plates and a pair of bearings. The eccentric drive assembly includes a drive wheel and a transmission wheel. The pair of support plates are disposed opposite to each other on the limiting block. The pressing assembly is located between the two support plates and can be displaced vertically. The support plate is provided with a bearing hole for mounting the bearing. The two bearings support the short column shaft and the long column shaft of the eccentric column, respectively. The drive wheel is connected to the drive motor, and the transmission wheel is connected to the long column shaft of the eccentric column.

[0011] Furthermore, the hoses are configured to pass through the grooves in parallel with each other. The support mechanism also includes a pair of support plates, which are fixed to the two ends of the support block respectively in the extension direction of the hoses. The support plates are provided with multiple support grooves, and each hose is supported by a pair of support grooves. The wedge-shaped part simultaneously squeezes each hose to cut off the flow path in each hose or simultaneously removes the squeezing of each hose to release the cut-off of the flow path in each hose.

[0012] To achieve another objective of this utility model, an inkjet printing device is provided, comprising multiple ink containers, printheads, and any of the above flow path switching devices. The liquid is the corresponding ink in each ink container, and multiple hoses are provided. The multiple ink containers are respectively connected to the multiple hoses, and the flow path switching devices control the synchronous opening or stopping of ink supply to the printheads.

[0013] The beneficial effects of this utility model are as follows:

[0014] This utility model relates to a flow path switching device and an inkjet printing equipment. By using a switching mechanism to squeeze or release the squeezing of the hose relative to the hose displacement, it can synchronously open or close the respective flow paths of all hoses. Therefore, it has the advantages of low cost and high reliability of synchronous switching of each flow path. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, and these are all within the protection scope of this utility model.

[0016] Figure 1 A schematic diagram of the overall structure of the flow path switch device provided in this embodiment of the utility model;

[0017] Figure 2 An exploded view of the flow path switch device provided in an embodiment of this utility model;

[0018] Figure 3 A schematic diagram of the transmission block and wedge block of the flow path switch device provided in an embodiment of this utility model from one perspective;

[0019] Figure 4 A schematic diagram of the transmission block and wedge block of the flow path switch device provided in an embodiment of this utility model from another perspective;

[0020] Figure 5 A schematic diagram of the structure of the limiting block of the flow path switch device provided in this embodiment of the utility model;

[0021] Figure 6A schematic diagram of the structure of the eccentric column of the flow path switching device provided in this embodiment of the utility model;

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Hose; 2. Support mechanism; 21. Support block; 22. Groove; 23. Support plate; 231. Support slot; 3. Switching mechanism; 31. Eccentric drive assembly; 311. Drive motor; 312. Eccentric column; 3121. Short column shaft; 3122. Long column shaft; 313. Drive wheel; 314. Transmission wheel; 32. Extrusion assembly; 321. Transmission block; 3211. Transmission plate; 3212. Limiting platform; 3213. Threaded countersunk hole; 322. Wedge block; 3221. Wedge part; 33. Support plate; 34. Bearing; 4. Limiting mechanism; 41. Limiting block; 411. Limiting slot; 412. Through slot; 413. Threaded through hole; 42. Elastic element. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element limited by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Unless otherwise specified, embodiments of the present invention and the various features thereof can be combined with each other, all within the protection scope of the present invention.

[0025] refer to Figures 1 to 6As an objective of this invention, a flow path switching device is provided, comprising a flexible hose 1, a support mechanism 2, a switching mechanism 3, and a limiting mechanism 4. Preferably, multiple hoses 1 have flow paths formed within them for liquid flow. In this embodiment, the liquid is inkjet printing ink, and the hoses 1 are corresponding ink tubes. The support mechanism 2 supports the hoses 1, allowing them to pass through. The switching mechanism 3 is displaceable between a closed position and an open position. In the closed position, the flow path within the hose 1 is cut off by squeezing the hose 1 supported on the support mechanism 2. In the open position, the hose 1 is no longer squeezed, and the cut-off is released by the restoring force of the hose 1. The limiting mechanism 4 limits the displacement formed by the switching mechanism 3. Therefore, the flow path switching device provided by this invention, by squeezing or releasing the squeezing of the hose 1 relative to the hose 1 through the displacement of the switching mechanism 3, can simultaneously open or close the respective flow paths of all hoses 1, thus having the advantages of low cost and high reliability of synchronous switching of each flow path.

[0026] Please refer to the reference. Figure 2 Specifically, the switching mechanism 3 includes an eccentric drive assembly 31 and a pressing assembly 32. The eccentric drive assembly 31 includes a drive motor 311 and an eccentric column 312 connected by a transmission. The pressing assembly 32 includes a transmission block 321 and a wedge block 322, which are preferably integrally formed. The eccentric column 312 presses against the transmission block 321. The free end of the wedge block 322 is provided with a wedge-shaped portion 3221 with rounded corners. The rounded corners of the wedge-shaped portion 3221 press against the hose 1, thereby preventing damage to the hose 1. Under the rotation of the eccentric column 312, the wedge-shaped portion 3221 moves towards and presses against the hose 1 or moves away from the hose 1 to prevent the hose 1 from being pressed. In this way, by rotating the eccentric column 312 under the drive of the drive motor 311, the eccentric column 312 can rotate to press against the transmission block 321 or rotate away from the transmission block 321 to drive the wedge block 322 to move up and down relative to the hose 1, thereby reliably realizing the squeezing and release of the hose 1.

[0027] Please refer to the reference. Figure 2 Specifically, in order to prevent the wedge block 322 from being damaged due to insufficient travel accuracy caused by a transmission structure that is prone to slippage, such as a belt, the drive motor 311 and the eccentric column 312 are connected by a sprocket, a synchronous pulley belt, or a gear set. The drive motor 311 is a stepper motor. In this embodiment, the switching mechanism 3 adopts a stepper motor and a synchronous pulley belt (not shown) as the driving method, so as to accurately control the force and travel of the wedge block 322 squeezing the hose 1, thereby stabilizing the squeezing of the hose 1 without excessively damaging the hose 1.

[0028] Please refer to the reference. Figure 2Specifically, the limiting mechanism 4 includes a limiting block 41 and an elastic element 42. In this embodiment, the elastic element 42 is a spring. The limiting block 41 is provided with a limiting groove 411 and a through groove 412. The wedge block 322 can move up and down relative to each other in the through groove 412. The transmission block 321 includes a connected transmission plate 3211 and a limiting platform 3212. The elastic element 42 is elastically compressed and arranged between the limiting groove 411 and the limiting platform 3212. The elastic element 42 applies an elastic restoring force to the limiting platform 3212 to maintain the pressure of the cylindrical surface of the eccentric column 312 against the transmission plate 3211. The transmission plate 3211 receives the rotation of the eccentric column 312. During the process, the elastic element 42 moves up and down due to the pressure, thereby correspondingly causing the compression amount of the elastic element 42 to decrease or increase. When the eccentric column 312 rotates so that the wedge portion 3221 is in the closed position and moves in the direction of squeezing the hose 1, the elastic element 42 is further compressed by the limiting table 3212, thereby increasing the compression amount and the elastic restoring force. When the eccentric column 312 rotates so that the wedge portion 3221 is in the open position and moves in the direction of removing the compression of the hose 1, the elastic element 42 releases the elastic restoring force to apply a force away from the limiting groove 411 to the limiting table 3212, thereby decreasing the compression amount and the elastic restoring force. In this way, the cooperation structure between the limiting block 41 and the limiting platform 3212 achieves precise positioning of the wedge block 322 relative to the through groove 412 on the limiting block 41. Furthermore, the elastic restoring force of the elastic element 42 can reset the transmission block 321 away from the hose 1 as the protruding part of the eccentric column 312 rotates away from the transmission block 321, thereby ensuring the repeated alternating control of the flow path opening and closing of the hose 1. In addition, the cylindrical surface of the eccentric column 312 can apply pressure evenly to the transmission block 321, and the precise cooperation between the wedge block 322 and the limiting block 41 can ensure that the wedge block 322 moves vertically up and down, so as to ensure that multiple hoses 1 are squeezed or released synchronously.

[0029] Please refer to the reference. Figures 3 to 5 Specifically, the projection of the transmission plate 3211 onto the horizontal plane is cross-shaped. The wedge block 322 is connected to the transverse centerline of the transmission plate 3211 and extends in a direction perpendicular to the transmission plate 3211. A pair of limiting platforms 3212 are located below the transmission plate 3211. The pair of limiting platforms 3212 extend relatively vertically away from each other on both sides of the wedge block 322 and are symmetrical with respect to a vertical centerline of the transmission plate 3211. A pair of limiting grooves 411 are provided. The pair of limiting grooves 411 extend relatively vertically away from each other on both sides of the through groove 412 and are symmetrical with respect to the centerline of the through groove 412. A pair of elastic elements 42 are provided, with an elastic element 42 arranged between the paired limiting platforms 3212 and limiting grooves 411. In this way, the overall structure of the transmission block 321 and the limiting block 41 is compact and reliably matched, and the displacement of the transmission block 321 relative to the limiting block 41 is smooth and precise.

[0030] Please refer to the reference. Figures 3 to 5Preferably, the limiting platform 3212 and the limiting groove 411 are arranged in pairs. The limiting platform 3212 and the limiting block 41 corresponding to the limiting groove 411 are respectively provided with a threaded countersunk hole 4213 and a threaded through hole 4213 that penetrate the transmission plate 3211. The screw of a bolt (not shown) is threaded and fixed by passing through the threaded countersunk hole 4213, the inner through hole of a spring (for example, the elastic element 42), and the threaded through hole 4213 in sequence. The screw guides the displacement of the transmission block 321 relative to the limiting block 41 away from or near it. The head of the bolt cooperates with the threaded countersunk hole 4213 to limit the maximum displacement of the transmission block 321 away from the limiting block 41. The elastic element 42 is sleeved on the outer periphery of the screw and is compressed and deformed along the axial direction of the screw. Therefore, when the protruding part of the eccentric column 312 rotates away from the transmission block 321, causing the elastic element 42 to push the wedge block 322 upward to reset, the head of the bolt at the position of the threaded countersunk hole 4213 can guide and limit the upper limit position of the wedge block 322.

[0031] Please refer to the reference. Figure 2 Preferably, the switching mechanism 3 further includes a pair of support plates 33 and a pair of bearings 34. The eccentric drive assembly 31 includes a drive wheel 313 and a transmission wheel 314. The pair of support plates 33 are disposed opposite to each other on the limiting block 41. The pressing assembly 32 is located vertically between the two support plates 33. The support plate 33 is provided with a bearing hole for mounting the bearing 34. The two bearings 34 respectively support the short column shaft 3121 and the long column shaft 3122 of the eccentric column 312. The drive wheel 313 is connected to the drive motor 311, and the transmission wheel 314 is connected to the long column shaft 3122 of the eccentric column 312. In this way, the eccentric column 312 can not only be reliably supported and positioned axially, but also reliably receive the driving force.

[0032] Please refer to the reference. Figure 2 Specifically, the support mechanism 2 includes a support block 21 and a groove 22 provided on the support block 21. The hose 1 passes over the groove 22, and the wedge-shaped portion 3221 enters the groove 22 to compress the hose 1. In this way, the groove 22 provides sufficient displacement space for the wedge-shaped portion 3221 to apply the compressive force to the hose 1, thereby ensuring that the flow path of the hose 1 is reliably closed.

[0033] Please refer to the reference. Figure 1 and Figure 2Preferably, multiple hoses 1 are arranged parallel to each other and pass through the grooves 22. The support mechanism 2 also includes a pair of support plates 23, which are fixed to the two ends of the support block 21 respectively in the extension direction of the hoses 1. The support plates 23 are provided with multiple support grooves 231, and each hose 1 is supported by a pair of support grooves 231. The wedge-shaped portion 3221 simultaneously squeezes each hose 1 to cut off the flow path in each hose 1 or simultaneously removes the squeezing of each hose 1 to release the cutoff of the flow path in each hose 1. Therefore, the two support plates 23 can reliably limit each hose 1 on the support block 21, ensuring that each hose 1 does not deviate in the radial direction when squeezed by the wedge-shaped portion 3221.

[0034] As another objective of this utility model, it also provides an inkjet printing device, which includes multiple ink containers, printheads, and any one of the above flow path switching devices. The liquid is the corresponding ink in the ink containers. Multiple hoses 1 are provided, which are also ink tubes. The multiple ink containers are respectively connected to the multiple hoses 1 and the flow path switching device controls the synchronous opening or stopping of ink supply to the printheads. The inkjet printing device can obtain the beneficial effects brought by any flow path switching device. Therefore, the inkjet printing device has the advantages of low cost and high reliability of synchronous switching of each flow path for ink supply to the printheads.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A flow path switching device, characterized in that, include: A flexible hose with internal flow paths to allow liquid to flow; Support mechanism, supporting the hose; A switching mechanism is movable between a closed position and an open position. In the closed position, the flow path in the hose is cut off by squeezing the hose supported on the support mechanism. In the open position, the hose is no longer squeezed, and the cut-off is released by the restoring force of the hose. A limiting mechanism is used to limit the displacement formed by the switching mechanism.

2. The flow path switching device according to claim 1, characterized in that, The switching mechanism includes an eccentric drive assembly and a compression assembly. The eccentric drive assembly includes a drive motor and an eccentric column connected by a transmission. The compression assembly includes a transmission block and a wedge block. The eccentric column presses against the transmission block. The free end of the wedge block is provided with a wedge-shaped portion with rounded corners. Under the rotation of the eccentric column, the wedge-shaped portion moves towards the hose and compresses it or moves away from the hose to prevent the hose from being compressed.

3. The flow path switching device according to claim 2, characterized in that, The drive motor is connected to the eccentric column via a sprocket, synchronous belt, or gear set, and the drive motor is a stepper motor.

4. The flow path switching device according to claim 2, characterized in that, The limiting mechanism includes a limiting block and an elastic element. The limiting block has a limiting groove and a through groove. The wedge block can move up and down relative to each other in the through groove. The transmission block includes a connected transmission plate and a limiting platform. The elastic element is elastically compressed and arranged between the limiting groove and the limiting platform. The elastic element applies an elastic restoring force to the limiting platform to maintain the pressure of the eccentric column's cylindrical surface against the transmission plate. The transmission plate receives the pressure force during the rotation of the eccentric column and moves up and down, thereby correspondingly causing the compression of the elastic element to decrease or increase. When the eccentric column rotates so that the wedge part corresponds to the closed position and moves in the direction of squeezing the hose, the elastic element is further compressed by the limiting platform, thereby increasing the compression and the elastic restoring force. When the eccentric column rotates so that the wedge part corresponds to the open position and moves in the direction of removing the squeezing of the hose, the elastic element releases the elastic restoring force to apply a force away from the limiting groove to the limiting platform, thereby decreasing the compression and the elastic restoring force.

5. The flow path switching device according to claim 4, characterized in that, The projection of the transmission plate on the horizontal plane is cross-shaped. The wedge block is connected to the transverse center line of the transmission plate and extends in a direction perpendicular to the transmission plate. The limiting platform is a pair located below the transmission plate. The pair of limiting platforms extend relatively vertically away from each other on both sides of the wedge block and are symmetrical with respect to a vertical center line of the transmission plate. The limiting groove is a pair. The pair of limiting grooves extend relatively vertically away from each other on both sides of the through groove and are symmetrical with respect to the center line of the through groove. The elastic element is a pair, and one elastic element is arranged between the paired limiting platforms and the limiting groove.

6. The flow path switching device according to claim 5, characterized in that, The limiting platform and the limiting groove are arranged in pairs. The limiting platform and the limiting block corresponding to the limiting groove are respectively provided with threaded countersunk holes and threaded through holes that pass through the transmission plate. The screw of a bolt passes through the threaded countersunk hole, the elastic element and the threaded through hole in sequence and is threaded and fixed. The screw guides the displacement of the transmission block relative to the limiting block away from or near it. The head of the bolt cooperates with the threaded countersunk hole to limit the maximum displacement of the transmission block away from the limiting block. The elastic element is sleeved on the outer periphery of the screw and is compressed and deformed along the axial direction of the screw.

7. The flow path switching device according to claim 2, characterized in that, The switching mechanism further includes a pair of support plates and a pair of bearings. The eccentric drive assembly includes a drive wheel and a transmission wheel. The pair of support plates are disposed opposite to each other on the limiting block. The pressing assembly is located between the two support plates and can be displaced vertically. The support plate is provided with a bearing hole for mounting the bearing. The two bearings respectively support the short column shaft and the long column shaft of the eccentric column. The drive wheel is connected to the drive motor, and the transmission wheel is connected to the long column shaft of the eccentric column.

8. The flow path switching device according to claim 2, characterized in that, The support mechanism includes a support block and a groove on the support block, the hose passes over the groove, and the wedge-shaped portion enters the groove to compress the hose.

9. The flow path switching device according to claim 8, characterized in that, The hoses are configured as multiple and pass through the grooves in parallel. The support mechanism also includes a pair of support plates. The support plates are fixed to the two ends of the support block respectively in the extension direction of the hoses. The support plates are provided with multiple support grooves. Each hose is supported by a pair of support grooves. The wedge-shaped part simultaneously squeezes each hose to cut off the flow path in each hose or simultaneously removes the squeezing of each hose to release the cutoff of the flow path in each hose.

10. An inkjet printing device, characterized in that, The device includes multiple ink containers, printheads, and a flow path switching device as described in any one of claims 1-9, wherein the liquid is the corresponding ink in each of the ink containers, and multiple hoses are provided, wherein the multiple ink containers are respectively connected to the multiple hoses and the flow path switching device controls the printhead to synchronously start or synchronously stop ink supply.

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