Printhead detection device for inkjet printing apparatus and inkjet printing apparatus

Abstract

The present application relates to the field of inkjet head detection, and more particularly to a kind of inkjet printing equipment's head detection device and inkjet printing equipment, comprising: spray detection base, fixed support is provided on spray detection base, the upper portion of fixed support is provided with spray detection observation part, and spray detection observation part is provided with spray detection observation window;Spray detection film winding and unwinding mechanism, including spray detection material discharge shaft assembly, spray detection material receiving shaft assembly and multiple spray detection film guide shaft, spray detection material discharge shaft assembly is provided on the material discharge shaft of spray detection material discharge shaft assembly;Spray detection component, camera is correspondingly arranged with spray detection film above spray detection observation window;Main control system, spray detection component and spray detection film winding and unwinding mechanism are electrically connected with main control system respectively.It can automatically realize whether the nozzle of inkjet head is blocked to be detected, to replace manual detection, improve printing effect and user experience.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of inkjet nozzle detection, and in particular, to a nozzle detection device for an inkjet printing apparatus and an inkjet printing apparatus. BACKGROUND

[0002] With the continuous development of inkjet printing technology, inkjet printers have been widely used in office, home, commercial printing and other fields. The core component of the inkjet printing apparatus is the nozzle, and the nozzle hole on the nozzle is responsible for accurately ejecting ink onto the medium to form an image or text. However, in the prior art, the nozzle hole of the nozzle may be blocked due to ink drying, impurities deposition and other reasons, thereby affecting the printing quality and efficiency.

[0003] In the common design of inkjet printer nozzle structure, in order to ensure the printing quality, the nozzle is usually cleaned before printing. However, this regular cleaning method cannot completely avoid the problem of nozzle hole blockage, especially in frequently used or long-term unused devices. In addition, for some special material ink or high viscosity ink, the problem of nozzle hole blockage is more prominent.

[0004] Therefore, in the prior art, in order to ensure the printing effect, it is often necessary to manually check whether the nozzle hole of the nozzle is blocked and take appropriate measures for cleaning. However, this method not only takes time and effort, but also is difficult to accurately judge the degree and position of blockage, which may affect the timeliness of the printing task and the printing quality.

[0005] In summary, in the prior art, the nozzle hole blockage of the inkjet printing apparatus is a common problem that affects the printing effect and user experience. Therefore, a device is needed to detect whether the nozzle hole of the inkjet nozzle is blocked. SUMMARY

[0006] The purpose of the present application is to provide a nozzle detection device for an inkjet printing apparatus, which can automatically detect whether the nozzle hole of the inkjet nozzle is blocked, instead of manual detection, to improve the printing effect and user experience.

[0007] Another purpose of the present application is to provide an inkjet printing apparatus, which can automatically detect whether the nozzle hole of the inkjet nozzle is blocked, instead of manual detection, to improve the printing effect and user experience.

[0008] The technical solution of the present application is as follows:

[0009] A nozzle detection device for an inkjet printing apparatus, comprising:

[0010] The spray detection base is provided with a fixed support, the upper part of the fixed support is provided with a spray detection observation part, and the spray detection observation part is provided with a spray detection observation window.

[0011] The spray detection film winding and unwinding mechanism comprises a spray detection unwinding shaft assembly, a spray detection winding shaft assembly and a plurality of spray detection film guide shafts.

[0012] The spray detection assembly comprises a camera, which is arranged corresponding to the spray detection film above the spray detection observation window.

[0013] The spray detection assembly and the spray detection film winding and unwinding mechanism are electrically connected with the main control system.

[0014] Further, the camera adopts a line scan camera, which is arranged on the fixed support below the spray detection observation window, and the camera head of the line scan camera is arranged corresponding to the spray detection observation window, for line scanning and photographing the spray detection film above the spray detection observation window.

[0015] Further, the spray detection unwinding shaft assembly comprises a first driving part and an unwinding shaft.

[0016] The first driving part is mounted on the fixed support, and the output end of the first driving part is connected and driven with the unwinding shaft through a magnetic torque transmission assembly.

[0017] Further, the spray detection unwinding shaft assembly comprises a second driving part and a winding shaft.

[0018] The second driving part is mounted on the fixed support, and the output end of the second driving part is also connected and driven with the winding shaft through a magnetic torque transmission assembly.

[0019] Further, the first driving part and the second driving part each adopt a stepping motor, the output shaft of the first driving part, the output shaft of the second driving part, the unwinding shaft and the winding shaft are all in a first direction.

[0020] The magnetic torque transmission assembly structure comprises a magnetic disk mounting seat, a driving magnetic disk and a driven magnetic disk, the output shaft of the stepping motor is mounted on the magnetic disk mounting seat, the driving magnetic disk is correspondingly mounted on the magnetic disk mounting seat, the end of the unwinding shaft or the winding shaft is mounted on the driven magnetic disk, and the driving magnetic disk and the driven magnetic disk are magnetically connected.

[0021] Further, a linear moving assembly is further included, and the linear moving assembly comprises:

[0022] A linear driving part is fixedly arranged on the top of the inspection base, and the moving direction of the linear driving part is the first direction;

[0023] A bracket is arranged on the linear driving part, and the linear driving part can drive the linear movement of the bracket;

[0024] The feeding shaft and the driven disc arranged on the feeding shaft are rotatably arranged on the bracket, the collecting shaft and the driven disc arranged on the collecting shaft are rotatably arranged on the bracket, and a plurality of the inspection film guide shafts are fixedly arranged on the bracket.

[0025] Further, the feeding shaft assembly is located above the collecting shaft assembly.

[0026] Further, a floating roller for tensioning the inspection film is further included, a limiting groove is arranged on the bracket along the first direction, the floating roller is arranged in the limiting groove, one end of the floating roller close to the fixed support is hingedly connected to the bracket, the other end of the floating roller can be lifted or lowered, the top wall of the limiting groove can limit the floating roller from being continuously lifted, the bottom wall of the limiting groove can limit the floating roller from being continuously lowered, and the inspection film passes below the floating roller.

[0027] Further, the linear driving part is a linear module, a linear slide or a cylinder.

[0028] Further, a material inspection unit arranged on the bracket is further included, the material inspection unit comprises a transmitting device and a receiving device, the transmitting device and the receiving device are arranged on opposite sides of the inspection film, the receiving device faces the transmitting device, and when there is no inspection film between the receiving device and the transmitting device, the receiving device can receive the detection light emitted by the transmitting device to trigger an alarm to remind the replacement of the film.

[0029] A kind of inkjet printing equipment, comprising the nozzle detection unit of the inkjet printing equipment.

[0030] Compared with the prior art, the beneficial effects of the present application are:

[0031] In the inkjet printing device, when a single nozzle moves to the top of the jet inspection observation window, the nozzle can spray on the jet inspection film above the jet inspection observation window and form a dot, and the corresponding position on the jet inspection film can be photographed by the camera of the jet inspection assembly and sent to the host system, and the image analysis module of the host system can perform image analysis and indirectly judge whether the nozzle orifice is blocked by detecting whether there is a dot on the jet inspection film; that is, when a dot is detected on the jet inspection film, the nozzle orifice is not blocked; when no dot is detected on the jet inspection film, the nozzle orifice is blocked, which replaces manual detection and improves printing effect and user experience. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0033] Figure 1 It is a schematic diagram of the overall structure of the nozzle detection device of the present application.

[0034] Figure 2 It is a schematic diagram of the structure of the hidden bracket and the components on the bracket.

[0035] Figure 3 It is a schematic diagram of the structure of the bracket and the components on the bracket.

[0036] In the drawings:

[0037] 1-jet inspection base; 2-fixed support; 3-jet inspection observation part; 301-jet inspection observation window;

[0038] 4-jet inspection material feeding shaft assembly; 401-first driving part; 402-material feeding shaft;

[0039] 5-jet inspection material collecting shaft assembly; 501-second driving part; 502-material collecting shaft;

[0040] 6-jet inspection film; 7-linear camera; 8-linear driving part; 9-bracket; 10-jet inspection film guide shaft; 11-floating roller; 12-material detection unit; 13-driving magnetic disk; 14-following magnetic disk; 15-plate. DETAILED DESCRIPTION

[0041] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0043] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0044] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0045] In addition, the terms "horizontal", "vertical", "overhang" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0046] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] Some embodiments of the present application will be described in detail with reference to the drawings. The following examples and features in the examples can be combined with each other in the case of no conflict.

[0048] Example 1

[0049] With reference to Figures 1-3 The present embodiment provides a nozzle detection device of an inkjet printing equipment, comprising:

[0050] The nozzle detection base 1 is provided with a fixed support 2, and the upper part of the fixed support 2 is provided with a nozzle detection observation part 3, and the nozzle detection observation part 3 is provided with a nozzle detection observation window 301.

[0051] The nozzle detection film 6 winding and unwinding mechanism comprises a nozzle detection unwinding shaft assembly 4, a nozzle detection winding shaft assembly 5 and a plurality of nozzle detection film guide shafts 10. The nozzle detection unwinding shaft assembly 4 is provided with a nozzle detection film roll on the unwinding shaft 402, and the nozzle detection winding shaft assembly 5 and the plurality of nozzle detection film guide shafts 10 are jointly wound with the nozzle detection film 6. At the same time, the nozzle detection film 6 passes directly above the nozzle detection observation window 301. The nozzle detection unwinding shaft assembly 4 and the nozzle detection winding shaft assembly 5 are respectively used for unwinding or winding the nozzle detection film 6, and the nozzle detection film guide shaft 10 is used for guiding the direction of the nozzle detection film 6.

[0052] The nozzle detection assembly comprises a camera, which is correspondingly arranged above the nozzle detection film 6 corresponding to the nozzle detection observation window 301.

[0053] The nozzle detection assembly and the nozzle detection film 6 winding and unwinding mechanism are respectively electrically connected with the main control system.

[0054] In the present embodiment, the camera adopts a line scan camera 7, which is arranged on the fixed support 2 and below the nozzle detection observation window 301. The camera head of the line scan camera 7 is correspondingly arranged with the nozzle detection observation window 301, which is used for line scanning and photographing the nozzle detection film 6 above the nozzle detection observation window 301. When a single nozzle moves directly above the nozzle detection observation window 301, the nozzle can spray on the nozzle detection film 6 directly above the nozzle detection observation window 301 and form a dot, and the line scan camera 7 of the nozzle detection assembly can perform line scanning and photographing on the corresponding position of the nozzle detection film 6 and send it to the main control system for image analysis.

[0055] In the present embodiment, the nozzle detection unwinding shaft assembly 4 comprises a first driving part 401 and an unwinding shaft 402.

[0056] The first driving part 401 is installed on the fixed support 2, and the output end of the first driving part 401 is connected and driven with the unwinding shaft 402 through a magnetic torque transmission assembly.

[0057] The nozzle detection unwinding shaft assembly 4 comprises a second driving part 501 and a winding shaft 502.

[0058] The second driving part 501 is installed on the fixed support 2, and the output end of the second driving part 501 is connected and driven with the material receiving shaft 502 through a magnetic torque transmission assembly.

[0059] The first driving part 401 and the second driving part 501 are both step motors, the output shafts of the first driving part 401 and the second driving part 501, the material feeding shaft 402 and the material receiving shaft 502 are all in the first direction;

[0060] The magnetic torque transmission assembly comprises a magnetic disk mounting base, a driving magnetic disk 13 and a driven magnetic disk 14. The output shaft of the step motor is installed on the magnetic disk mounting base, the driving magnetic disk 13 is installed on the magnetic disk mounting base, the end of the material feeding shaft 402 or the material receiving shaft 502 is installed on the driven magnetic disk 14, and the driving magnetic disk 13 and the driven magnetic disk 14 are magnetically connected. The output shafts of the first driving part 401 and the second driving part 501 are connected with the corresponding magnetic disk mounting bases through couplings. In this way, the first driving part 401 drives the material feeding shaft 402 to rotate through a magnetic torque transmission assembly, and then synchronously drives the inspection film roll on the material feeding shaft 402 to rotate to realize material feeding. Similarly, the second driving part 501 drives the material receiving shaft 502 to rotate through another magnetic torque transmission assembly, and then synchronously drives the inspection film 6 on the material receiving shaft 502 to rotate to realize material receiving.

[0061] The linear movement assembly comprises:

[0062] The linear driving part 8 is fixedly arranged on the top of the inspection base 1, and the moving direction of the linear driving part 8 is the first direction. The linear driving part 8 can be a linear module, a linear slide or a pneumatic cylinder. Preferably, the linear driving part 8 is arranged on the inspection base 1 through the supporting plate 15.

[0063] The bracket 9 is arranged on the linear driving part 8, and the linear driving part 8 can drive the linear movement of the bracket 9.

[0064] The material feeding shaft 402 and the driven magnetic disk 14 installed on the material feeding shaft 402 are rotatably arranged on the bracket 9, the material receiving shaft 502 and the driven magnetic disk 14 installed on the material receiving shaft 502 are rotatably arranged on the bracket 9, and the plurality of inspection film guide shafts 10 are fixedly arranged on the bracket 9. Preferably, the material feeding shaft 402 and the material receiving shaft 502 are rotatably connected with the bracket 9 through bearings or bearing seats.

[0065] Since the driving magnetic disc 13 and the driven magnetic disc 14 in the spraying inspection discharging shaft assembly 4 are connected by magnetic attraction and can be separated, and the driving magnetic disc 13 and the driven magnetic disc 14 in the spraying inspection collecting shaft assembly 5 are also connected by magnetic attraction and can be separated, and a linear moving assembly is designed, the bracket 9 and the components (including the collecting shaft 502, the discharging shaft 402 and the spraying inspection film guide shaft 10) on the bracket 9 are driven by the linear driving part 8 to move from one end close to the fixed support 2 to the other end away from the fixed support 2, that is, from the B end to the A end of the linear driving part 8, when the bracket 9 moves to the A end, the bracket 9 is in a relatively empty position, which is convenient for replacing the spraying inspection film 6. Conversely, when the replacement is completed, the driven magnetic disc 14 on the discharging shaft 402 is reconnected with the driving magnetic disc 13 on the first driving part 401 by magnetic attraction, and the driven magnetic disc 14 on the collecting shaft 502 is reconnected with the driving magnetic disc 13 on the second driving part 501 by magnetic attraction, and then the first driving part 401 can continue to drive the discharging shaft 402 to rotate, and the second driving part 501 can continue to drive the collecting shaft 502 to rotate.

[0066] The floating roller 11 for tensioning the spraying inspection film 6 is further included, a limiting groove is formed in the bracket 9 in a first direction, the floating roller 11 is arranged in the limiting groove, and the floating roller 11 is hinged to the bracket 9 at one end close to the fixed support 2, the other end of the floating roller 11 can be lifted or lowered, the top wall of the limiting groove can limit the floating roller 11 from being continuously lifted, the bottom wall of the limiting groove can limit the floating roller 11 from being continuously lowered, and the spraying inspection film 6 passes below the floating roller 11.

[0067] In the embodiment, the spraying inspection discharging shaft assembly 4 is located directly above the spraying inspection collecting shaft assembly 5, when the spraying inspection film 6 is collected by the spraying inspection discharging shaft assembly 4, the spraying inspection film 6 is collected upward, and the floating roller 11 is lifted upward until the floating roller 11 contacts the top wall of the limiting groove and cannot be continuously lifted, so that the spraying inspection film 6 is tightened, at this time, the floating roller 11 plays a tensioning role on the spraying inspection film 6. When the spraying inspection film 6 is discharged by the spraying inspection discharging shaft assembly 4, the spraying inspection film 6 is in a relaxed state, and the floating roller 11 is lowered automatically under the action of gravity until the floating roller 11 contacts the bottom wall of the limiting groove and cannot be continuously lowered, so that the spraying inspection film 6 is in a very relaxed state, which is convenient for discharging.

[0068] In the embodiment, the spraying inspection film guide shaft 10 is provided with three spraying inspection film guide shafts, one of which is arranged close to the floating roller 11, and preferably, the spraying inspection film guide shaft 10 is higher than the height of the floating roller 11; the other two spraying inspection film guide shafts 10 are arranged on the two sides of the spraying inspection observation part 3, as shown in Figure 1

[0069] ​It also includes a material detection unit 12 mounted on the bracket 9. The material detection unit 12 includes a transmitting device and a receiving device, which are respectively positioned on opposite sides of the spray-on inspection film 6, with the receiving device facing the transmitting device. The receiving device receives the detection light emitted by the transmitting device, triggering the detection unit to sound an alarm, quickly reminding staff to replace the film in a timely manner. During the spraying and conveying process of the inspection film 6, automatic and real-time detection can be achieved, promptly reminding staff and solving the problem of untimely film replacement. Furthermore, the main structure is mechanical, resulting in low cost and long service life. Note: The transmitting and receiving devices of the material detection unit 12 are existing technologies and will not be described in detail here.

[0070] The overall working principle is as follows:

[0071] In an inkjet printer, when a single printhead moves directly above the inspection window 301, it can spray ink onto the inspection film 6 directly above the inspection window 301, forming ink dots. The line scan camera 7 of the inspection component can take pictures of the corresponding positions on the inspection film 6 and send them to the main control system. The image analysis module of the main control system can perform image analysis (note: image analysis using the image analysis module of the main control system is existing technology and will not be described in detail here). By detecting whether there are ink dots on the inspection film 6, it can indirectly determine whether the printhead nozzle is blocked; that is, when ink dots are detected on the inspection film 6, the printhead nozzle is not blocked; when no ink dots are detected on the inspection film 6, the printhead nozzle is blocked.

[0072] When the material detection unit 12 detects a shortage of material in the sprayed inspection film 6, it sends a signal to the main control system and triggers an alarm. The linear drive unit 8 then moves the bracket 9 and its components to end A for manual material replacement. After replacement, the linear drive unit 8 pushes the bracket 9 and its components back to end B. The driven disk 14 on the feeding shaft 402 is magnetically reconnected to the active disk 13 on the first drive unit 401, and the driven disk 14 on the receiving shaft 502 is magnetically reconnected to the active disk 13 on the second drive unit 501, completing the material replacement. Note that when the linear drive unit 8 moves the bracket 9 back to end B, the pushing action of the linear drive unit 8 enables automatic locking and positioning of the bracket 9.

[0073] After the detection of a single nozzle is completed, when the next nozzle is observed, the spray detection film 6 needs to be fed with new material. Process: first, the first driving part 401 (using a stepper motor) drives the spray detection material feeding shaft assembly 4 to feed material through the magnetic torque transmission assembly, and the feeding length is determined by the lower limit of the floating roller 11. At this time, the floating roller 11 is in contact with the bottom wall of the limiting groove. Then, the second driving part 501 (using a stepper motor) drives the spray detection material collecting shaft assembly 5 to collect material through the magnetic torque transmission assembly to the upper limit of the floating roller 11. At this time, the floating roller 11 is in contact with the top wall of the limiting groove, and the spray detection film 6 is tensioned. Repeat the above photographing and observing operation, that is, use the line scanning camera 7 to line scan, take pictures and detect whether the nozzle hole is blocked.

[0074] Embodiment 2

[0075] An inkjet printing device, comprising a moving mechanism, a multi-nozzle PACK group and a nozzle detection unit of the inkjet printing device.

[0076] The moving mechanism is composed of an X-direction linear module, a Y-direction linear module and a Z-direction linear module, which belongs to the conventional technology, and the structure and connection relationship will not be described again. The multi-nozzle PACK group is driven by the moving mechanism to move in any direction of X, Y and Z. When the nozzle of the multi-nozzle PACK group moves to the position directly above the spray detection observation window 301, the nozzle detection operation can be performed.

[0077] The beneficial effects of the technical scheme of the present application are:

[0078] 1. In the inkjet printing device, when a single nozzle moves to the position directly above the spray detection observation window 301, the nozzle can spray on the spray detection film 6 directly above the spray detection observation window 301 and form a dot, and the camera of the spray detection assembly can take a picture of the corresponding position on the spray detection film 6 and send it to the main control system. The image analysis module of the main control system can perform image analysis and indirectly judge whether the nozzle hole is blocked and whether the inkjet is normal by detecting whether there is a dot on the spray detection film 6. That is, when a dot is detected on the spray detection film 6, the nozzle hole is not blocked. When no dot is detected on the spray detection film 6, the nozzle hole is blocked.

[0079] 2. The first driving part 401 and the material feeding shaft 402, and the second driving part 501 and the material collecting shaft 502 can be detachably separated, which is convenient for material replacement.

[0080] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0081] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. The present application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. A head detection device of an inkjet printing apparatus, characterized by comprising: The utility model relates to a kind of spray detection base (1), which is provided with fixed support (2) on the spray detection base (1), the upper portion of the fixed support (2) is provided with spray detection observation part (3), and the spray detection observation part (3) is provided with spray detection observation window (301). The spray detection film (6) winding and unwinding mechanism includes a spray detection unwinding shaft assembly (4), a spray detection winding shaft assembly (5) and a plurality of spray detection film guide shafts (10). The unwinding shaft (402) of the spray detection unwinding shaft assembly (4) is provided with a spray detection film roll, and the winding shaft (502) of the spray detection winding shaft assembly (5) and the plurality of spray detection film guide shafts (10) are jointly wound with the spray detection film (6). At the same time, the spray detection film (6) passes directly above the spray detection observation window (301). The spray detection unwinding shaft assembly (4) and the spray detection winding shaft assembly (5) are respectively used for unwinding or winding the spray detection film (6). The spray detection film guide shafts (10) are used for guiding the movement of the spray detection film (6). The spray detection assembly includes a camera corresponding to the spray detection film (6) directly above the spray detection observation window (301). The spray detection assembly and the spray detection film (6) winding and unwinding mechanism are electrically connected to the main control system. The spray detection unwinding shaft assembly (4) includes a first driving part (401) and an unwinding shaft (402). The first driving part (401) is installed on the fixed support (2). The output end of the first driving part (401) is connected and driven with the unwinding shaft (402) through a magnetic torque transmission assembly. The spray detection unwinding shaft assembly (4) includes a second driving part (501) and a winding shaft (502). The second driving part (501) is installed on the fixed support (2). The output end of the second driving part (501) is also connected and driven with the winding shaft (502) through a magnetic torque transmission assembly. The first driving part (401) and the second driving part (501) respectively adopt a stepping motor. The output shaft of the first driving part (401), the output shaft of the second driving part (501), the unwinding shaft (402) and the winding shaft (502) are all in the first direction. The magnetic torque transmission assembly structure includes a magnetic disk mounting seat, a driving magnetic disk (13) and a driven magnetic disk (14). The output shaft of the stepping motor is installed on the magnetic disk mounting seat. The driving magnetic disk (13) is correspondingly installed on the magnetic disk mounting seat. The end of the unwinding shaft (402) or the winding shaft (502) is installed on the driven magnetic disk (14). The driving magnetic disk (13) and the driven magnetic disk (14) are magnetically connected. The utility model also includes a linear movement assembly, which includes: A linear driving part (8) is fixedly arranged on the top of the spray detection base (1), and the moving direction of the linear driving part (8) is the first direction. A bracket (9) is arranged on the linear driving part (8). The linear driving part (8) can drive the linear movement of the bracket (9). ​ The feeding shaft (402) and the driven disk (14) mounted on the feeding shaft (402) are rotatably mounted on the bracket (9), the collecting shaft (502) and the driven disk (14) mounted on the collecting shaft (502) are rotatably mounted on the bracket (9), and a plurality of the film guide shafts (10) are fixedly mounted on the bracket (9).

2. The print head detection apparatus of claim 1, wherein The camera adopts a line scanning camera (7) which is arranged on the fixed support (2) below the film observation window (301), and the camera head of the line scanning camera (7) is arranged correspondingly to the film observation window (301) for line scanning and photographing the film (6) above the film observation window (301).

3. The print head detection apparatus of claim 1, wherein The film feeding shaft assembly (4) is located directly above the film collecting shaft assembly (5).

4. The print head detection apparatus of claim 1, wherein The linear drive part (8) adopts a linear module, a linear slide or a cylinder.

5. The print head detection apparatus of claim 1, wherein A material detection unit (12) is arranged on the bracket (9), the material detection unit (12) comprises a transmitting device and a receiving device, the transmitting device and the receiving device are arranged on opposite sides of the film (6), the receiving device faces the transmitting device, and when there is no film (6) between the receiving device and the transmitting device, the receiving device can receive the detection light emitted by the transmitting device to trigger an alarm to remind the replacement of the film.

6. An inkjet printing apparatus characterized by comprising: A nozzle detection unit of an inkjet printing device according to any one of claims 1-5.

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