Ink-jet printing system

Abstract

The invention discloses an ink-jet printing system which comprises an ink-jet printing device and a product to be printed, the ink-jet printing device is provided with a bottom plate, the bottom plate is provided with a first mounting hole used for mounting a pre-fixed lamp, and a spray head is arranged on the upstream side of the pre-fixed lamp; the pre-fixed lamp is arranged in the shading cylinder, at least one first light transmitting hole is formed in the side wall of the shading cylinder in the circumferential direction, and the relative position of the light source emergent surface of the pre-fixed lamp and the first light transmitting hole can be adjusted; a shading plate is arranged at the bottom of the first mounting hole, the shading plate is fixedly connected with the bottom plate, and a second light hole is formed in the shading plate; by adjusting the relative position of the light source emergent face of the pre-curing lamp and the first light hole, in the pre-curing process of the product, light emitted by the pre-curing lamp is emitted to the side wall of the shading barrel or the shading plate, or the light emitted by the pre-curing lamp penetrates through the first light hole and the second light hole and is emitted to the to-be-printed face of the product. According to the ink-jet printing system, the technical problem of how to prevent light of the pre-fixed lamp from being reflected into the spray head in the prior art is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of inkjet printing, and in particular relates to an inkjet printing system. Background Art

[0002] UV insulating ink printing process on battery cell surface When printing battery cells, in order to prevent the ink from flowing out from the nozzle to the battery surface, resulting in loss of precision of the printed area boundary dimensions and thinning of the printed thickness, a pre-curing lamp needs to be installed behind the nozzle for pre-curing. The closer the distance between the pre-curing lamp and the nozzle, the better the curing effect. The inkjet printing device currently used includes a base plate, which is provided with a plurality of first mounting holes for installing pre-curing lamps and a second mounting hole for installing the nozzle. The pre-curing lamp and the nozzle are fixedly connected to the base plate respectively, and the pre-curing lamp is spaced apart from the nozzle and the pre-curing lamp is arranged on the downstream side of the nozzle. A photoelectric sensor is provided on the outer side of the upstream end of the base plate, which is used to sense the product to be printed, thereby controlling the inkjet of the nozzle. The product to be printed is fixed by a product fixing fixture, and inkjet printing and pre-curing operations are performed during the product moving from one end to the other end under the base plate. In order to improve the pre-curing effect, the pre-curing lamp is usually installed at an angle of about 5° toward the nozzle. The installation distance between the center of the pre-curing lamp and the edge of the nozzle is generally 100-150mm, and the pre-curing lamp and the nozzle cannot be installed close to each other. Due to the irregular surface shape of the battery cell and the battery cell fixing fixture, and when multiple nozzles are used for multiple printings with overlapping thickness, it is very easy for UV light to be reflected into the nozzle, causing the ink in the nozzle hole to be cured, thereby clogging the nozzle hole and causing the nozzle to be scrapped.

[0003] China Utility Model Patent Authorization Announcement No. CN203427457U discloses an inkjet printing device, including a base plate, a nozzle and a pre-curing device, wherein the nozzle and the pre-curing device are installed on the base plate at intervals, the nozzle surface of the nozzle is on the same horizontal plane as the lower plane of the base plate, and the light source exit surface of the pre-curing device is higher than the lower plane of the base plate. The utility model inkjet printing device raises the installation position of the pre-curing device so that the oblique light of the pre-curing device is partially blocked by the inner wall of the mounting hole on the base plate, ensuring that most of the ultraviolet light is irradiated vertically downward, thereby ensuring that the UV ink printed on the printed object is cured while avoiding the curing of the ink of the nozzle of the nozzle. The light emitted by the light source includes both vertical downward and oblique light. Since the light emitted by the light source of the pre-curing device is not adjusted, part of the oblique light will be reflected into the nozzle by the product fixing fixture or other parts during the process of the product to be printed moving from one side below the mounting hole to the other side, thereby causing the ink of the nozzle of the nozzle to be cured. Summary of the invention

[0004] In view of the existing technical problems, the present invention aims to provide an inkjet printing system, which can solve the technical problem in the prior art of how to prevent the light of the pre-fixing lamp from being reflected into the nozzle.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] An inkjet printing system comprises an inkjet printing device and a product to be printed, wherein the inkjet printing device is provided with a base plate, the base plate is provided with a first mounting hole for mounting a pre-curing lamp, and a nozzle is arranged on the upstream side of the pre-curing lamp; its structural features are as follows: the pre-curing lamp is arranged in a light-shielding tube, the side wall of the light-shielding tube is provided with at least one first light-transmitting hole along the circumferential direction, and the relative position between the light source emitting surface of the pre-curing lamp and the first light-transmitting hole is adjustable; a light-shielding plate is provided at the bottom of the first mounting hole, the light-shielding plate is fixedly connected to the base plate, and a second light-transmitting hole is provided on the light-shielding plate; by adjusting the relative position between the light source emitting surface of the pre-curing lamp and the first light-transmitting hole, during the pre-curing process of the product, the light emitted by the pre-curing lamp is directed toward the side wall of the light-shielding tube or the light-shielding plate, or the light emitted by the pre-curing lamp passes through the first light-transmitting hole and the second light-transmitting hole and is directed toward the surface to be printed of the product.

[0007] By setting the light shielding tube and the light shielding plate, the light emitted by the pre-fixing lamp can only be emitted outward through the first light-transmitting hole and the second light-transmitting hole. By adjusting the relative position of the light source exit surface of the pre-fixing lamp and the first light-transmitting hole, the light emitted by the light source of the pre-fixing lamp below the second light-transmitting hole can only be irradiated to the surface to be printed on the product, thereby preventing the light from irradiating other parts and being reflected into the nozzle, which can increase the service life of the nozzle.

[0008] Preferably, the inkjet printing system is further provided with a driving mechanism, the output end of which is connected to a light shielding cylinder, which is arranged along the width direction of the bottom plate; the light shielding cylinder can rotate around its axis under the drive of the driving mechanism. The pre-fixed lamp is fixedly arranged, and the relative position of the light source exit surface of the pre-fixed lamp and the first light transmission hole is adjusted by rotating the light shielding cylinder.

[0009] Preferably, the shape and size of the second light-transmitting hole are matched with the shape and size of the projection of the surface to be printed on the bottom plate of the product, the first light-transmitting hole and the second light-transmitting hole are of the same shape, and the size of the first light-transmitting hole is not larger than the size of the second light-transmitting hole; when the first light-transmitting hole is rotated to the bottom of the light-shielding cylinder and the product is moved below the pre-curing lamp, the first light-transmitting hole, the second light-transmitting hole and the projection of the surface to be printed on the bottom plate of the product are overlapped. By setting the shape, size and position of the first light-transmitting hole and the second light-transmitting hole, the product can receive as much irradiation of the pre-curing light as possible during pre-curing, thereby improving the pre-curing effect.

[0010] Preferably, the light source of the pre-fixing lamp is located above the second light-transmitting hole, and the rotation speed and direction of the light-shielding cylinder match the moving speed and direction of the product respectively; when the product moves from the edge of one side of the second light-transmitting hole to the bottom of the pre-fixing lamp in the direction of the pre-fixing lamp, the amount of light from the pre-fixing lamp received by the surface to be printed of the product gradually increases; thereafter, when the product continues to move downstream, the amount of light from the pre-fixing lamp received by the surface to be printed of the product gradually decreases until the light from the pre-fixing lamp is blocked by the light-shielding cylinder. By setting the rotation speed and direction of the light-shielding cylinder, the rotation of the light-shielding cylinder is synchronized with the movement of the product. When the product moves to the edge of the second light-transmitting hole, the light emitted by the light source of the pre-fixing lamp just passes through the first light-transmitting hole and the second light-transmitting hole to the surface to be printed of the product, and the light-shielding cylinder and the product reach the same linear speed. As the product continues to move until it is directly below the pre-fixing lamp, the surface to be printed of the product receives more and more light from the pre-fixing lamp until the entire surface to be printed of the product is located in the irradiation area of ​​the pre-fixing lamp. As the product continues to move downstream, the light from the pre-curing lamp received by the product's surface to be printed becomes less and less until the entire surface to be printed moves out of the irradiation area of ​​the pre-curing lamp. At this time, the light of the pre-curing lamp is blocked by the light shielding tube, so that the product can receive the maximum amount of pre-curing light during the pre-curing operation, further improving the pre-curing effect, improving the ink printing quality and product yield, reducing product costs, and adapting to complex printing conditions with multiple nozzles at the front and back.

[0011] Preferably, the driving mechanism includes a motor, a first gear disposed on the output end of the motor, and a second gear meshing with the first gear, and the end of the light-shielding tube is connected to the end of the second gear; preferably, the light-shielding tube and the second gear, as well as the light-shielding plate and the base plate, are all detachably and fixedly connected. In order to match the moving speed of the product, the rotation speed of the light-shielding tube needs to be adjusted. By adjusting the number of teeth of the first gear and the second gear and the rotation speed of the motor, the rotation speed of the light-shielding tube can be adjusted as needed, so that during the pre-curing process of the product, the light emitted by the light source of the pre-curing lamp below the second light-transmitting hole only irradiates the surface of the product to be printed. When the surface of the product to be printed changes, it is only necessary to replace the light-shielding tube and the base plate, and change the size of the first light-transmitting hole on the light-shielding tube and the second light-transmitting hole on the base plate, thereby improving the applicability of the inkjet printing device.

[0012] Specifically, the pre-fixed lamp is connected to the fixing plate through a first fixing member, the first fixing member passes through the axis of the second gear, the motor, the first gear and the second gear are all connected to the fixing plate, and the bottom of the fixing plate is fixedly connected to the bottom plate. The pre-fixed lamp and the driving mechanism are both arranged on the fixing plate. When installing, only the fixing plate needs to be fixed on the bottom plate to realize the installation of the pre-fixed lamp and the driving mechanism, thereby improving the convenience of installation.

[0013] Preferably, a groove is provided between two adjacent first light-transmitting holes on the side wall of the outer end of the light-shielding tube, and a groove-type photoelectric switch is provided on the bottom plate, and the sensing end of the groove-type photoelectric switch is slidably connected to the side wall of the outer end of the light-shielding tube; the groove-type photoelectric switch is electrically connected to the motor, and when the motor drives the light-shielding tube to move until the groove is located in the sensing end of the groove-type photoelectric switch, the motor stops driving the light-shielding tube. By providing the groove-type photoelectric switch, the rotation stop of the light-shielding tube can be positioned, and when the product needs to be pre-cured, the light-shielding tube rotates; when the pre-curing is completed, the groove moves to the sensing end of the groove-type photoelectric switch, the light-shielding tube stops rotating, and the light emitted by the light source of the pre-cured lamp is blocked by the side wall of the light-shielding tube.

[0014] Preferably, a photoelectric sensor is provided on the outer side of the upstream end of the bottom plate, and the photoelectric sensor, the nozzle, the motor and the slot photoelectric switch are all electrically connected to the control system. The entire inkjet and pre-curing process of the product is controlled by the control system to achieve automatic control.

[0015] Preferably, the first light-transmitting holes are provided in plurality, and the plurality of first light-transmitting holes are evenly distributed along the circumferential side wall of the light-shielding cylinder, and the distance between the groove and two adjacent first light-transmitting holes is equal. The products to be printed are generally arranged at a certain interval for inkjet printing and then pre-cured. In actual use, the distance between the first light-transmitting holes and the groove can be set according to the distance between the products and the rotation speed of the light-shielding cylinder.

[0016] Preferably, the distance between the center of the pre-curing lamp and the edge of the nozzle on the inkjet printing device is not greater than 90 mm. The inkjet printing system of the present invention can overcome the constraint that the pre-curing lamp and the nozzle cannot be installed close to each other, thereby improving the pre-curing effect.

[0017] Preferably, the shape and size of the first light-transmitting hole and the second light-transmitting hole can be adjusted according to the shape and size of the projection of the surface to be printed on the bottom plate of the product. By arranging one or more baffles on the light-shielding plate and the light-shielding cylinder, and arranging a driving device on the baffle, the baffle is driven to move by the driving device, thereby adjusting the shape and size of the first light-transmitting hole and the second light-transmitting hole, so that the shape and size of the first light-transmitting hole and the second light-transmitting hole match the shape and size of the projection of the surface to be printed on the bottom plate of the product.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The inkjet printing system of the present invention effectively increases the service life of the nozzle.

[0020] 2. The inkjet printing system of the present invention can be used in complex printing environments with multiple front and rear nozzles.

[0021] 3. The inkjet printing system of the present invention overcomes the constraint that the pre-curing lamp and the nozzle cannot be installed in close proximity, thereby improving the pre-curing effect.

[0022] 4. The inkjet printing system of the present invention improves the ink printing quality, improves the product yield, and reduces the product cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of an inkjet printing system of the present invention;

[0024] Figure 2 yes Figure 1 A schematic diagram of a front view structure;

[0025] Figure 3 yes Figure 1 Schematic diagram of the structure viewed from above;

[0026] Figure 4 yes Figure 1 Schematic diagram of the light path of the pre-fixation lamp when the product is located on the right side of the pre-fixation lamp;

[0027] Figure 5 yes Figure 1 Schematic diagram of the light path of the pre-fixation lamp when the product is located directly under the pre-fixation lamp;

[0028] Figure 6 yes Figure 1 Schematic diagram of the light path of the pre-fixation lamp when the product is located on the left side of the pre-fixation lamp.

[0029] In the figure

[0030] 1-product, 2-photoelectric sensor, 3-bottom plate, 4-nozzle, 5-driving mechanism, 501-motor, 502-first gear, 503-second gear, 6-fixing plate, 7-first light-transmitting hole, 8-second light-transmitting hole, 9-slot-type photoelectric switch, 10-pre-fixed lamp, 11-light-shielding tube, 12-first fixing part, 13-light-shielding plate, 14-groove. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0032] like Figure 1As shown, an inkjet printing system of the present embodiment includes an inkjet printing device and a plurality of products 1 to be printed arranged at intervals below the inkjet printing device, the outer edge of the surface to be printed of the product 1 is circular, and the product 1 is a battery. Two nozzles 4 are arranged at intervals along the length direction on the bottom plate 3 of the inkjet printing device, and the downstream side of the nozzle 4 is provided with a first mounting hole 11 for mounting a pre-fixing lamp 10. The pre-fixing lamp 10 is arranged in a light-shielding tube 11, and the light source of the pre-fixing lamp 10 is located directly above the second light-transmitting hole 8. The light-shielding tube 11 is a cylindrical structure, and the light-shielding tube 11 is arranged in the first mounting hole 11 along the width direction of the bottom plate 3, the diameter of the cylindrical body is 160 mm, and the distance between the center of the pre-fixing lamp 10 and the edge of the nozzle 4 is 85 mm. The light shielding tube 11 can rotate around its axis under the drive of the driving mechanism 5, and the driving mechanism 5 includes a motor 501, a first gear 502 arranged on the output end of the motor 501, and a second gear 503 meshing with the first gear 502, and the first gear 502 is arranged above the second gear 503. The end of the light shielding tube 11 along the length direction is fixedly connected to one end of the second gear 503, and the other end of the second gear 503 is provided with a fixing plate 6. Figure 2 As shown, the pre-fixed lamp 10 is connected to the fixing plate 6 through the first fixing member 12, the first fixing member 12 is fixedly connected to the inner ring of the bearing at the axis of the second gear 503, the motor 501, the first gear 502 and the second gear 503 are all connected to the fixing plate 6, and the bottom of the fixing plate 6 is fixedly connected to the bottom plate 3. Figure 1 and Figure 3 As shown, the side wall of the light-shielding tube 11 is evenly provided with a plurality of first light-transmitting holes 7 along the circumferential direction, and a light-shielding plate 13 is provided at the bottom of the first mounting hole 11, and a second light-transmitting hole 8 is provided on the light-shielding plate 13. The first light-transmitting hole 7 and the second light-transmitting hole 8 are both circular holes, and are both adapted to the size of the outer edge of the surface to be printed of the product 1. When the product 1 moves to the bottom of the pre-fixing lamp 10 and the first light-transmitting hole 7 on the light-shielding tube 11 rotates to the bottom, the first light-transmitting hole 7, the second light-transmitting hole 8 and the projection of the surface to be printed of the product 1 on the bottom plate 3 completely overlap. A groove 14 is provided between two adjacent first light-transmitting holes 7 on the side wall of the outer end of the light-shielding tube 11, and the distance between the groove 14 and the two adjacent first light-transmitting holes 7 is equal. A slot-type photoelectric switch 9 is provided on the bottom plate 3, and the sensing end of the slot-type photoelectric switch 9 is slidably connected to the side wall of the outer end of the light-shielding tube 11. As shown Figure 1As shown, a photoelectric sensor 2 is provided on the outer side of the upstream end of the bottom plate 3, and the photoelectric sensor 2, the nozzle 4, the motor 501 and the slot-type photoelectric switch 9 are all electrically connected to the control system. The rotation speed of the motor 501 is set according to the movement speed of the product 1, the distance between the nozzle 4 and the pre-fixing lamp 10, the diameter of the light shielding tube 11, etc., so that the rotation speed and direction of the light shielding tube 11 match the movement speed and direction of the product 1 respectively. When the product 1 moves toward the direction of the pre-fixing lamp 10 and the product 1 moves from one side edge of the second light-transmitting hole 8 to the other side edge of the second light-transmitting hole 8, the light emitted by the light source of the pre-fixing lamp 10 to the outside of the second light-transmitting hole 8 is only emitted to the surface to be printed of the product 1, and the other light emitted by the light source of the pre-fixing lamp 10 is irradiated to the side wall of the light shielding tube 11 or the light shielding plate 13.

[0033] The working principle and process of the nozzle printing system of this embodiment are as follows: Figure 1 As shown, when the battery moves close to the inkjet printing device, the photoelectric sensor 2 is triggered, and the photoelectric sensor 2 sends a signal to the control system to control the rotation start of the motor 501 and the inkjet operation of the nozzle 4. When the battery passes under the nozzle 4, the nozzle 4 sprays ink onto the surface of the battery to be printed; the battery continues to move forward after printing, and at this time the light shielding tube 11 has also been turned on to rotate clockwise; when the outer edge of the surface of the battery to be printed and the edge of the second light-transmitting hole 8 begin to overlap, the light-shielding tube 11 and the battery reach the same linear speed; when the battery moves toward the pre-fixing lamp 10 from the right edge of the second light-transmitting hole 8 to directly below the pre-fixing lamp 10, the surface of the battery to be printed receives The amount of light from the pre-curing lamp 10 gradually increases until the entire surface of the battery to be printed is within the irradiation area of ​​the pre-curing lamp 10; when the product 1 moves from directly below the pre-curing lamp 10 to the left edge of the second light-transmitting hole 8, the light from the pre-curing lamp 10 received by the surface of the battery to be printed becomes less and less until the entire surface of the product to be printed moves out of the irradiation area of ​​the pre-curing lamp 10, at which time the light from the pre-curing lamp 10 is blocked by the light-shielding tube 11; when the battery is completely out of the irradiation area, the light-shielding tube 11 continues to rotate until the groove 14 moves into the sensing end of the slot-type photoelectric switch 9, and stops, waiting for the next battery operation; the battery continues to move forward, and subsequent nozzle and pre-curing operations are carried out. During the entire pre-curing process, if Figure 4 , Figure 5 and Figure 6 As shown in the figure, the straight line with an arrow represents the light emitted by the light source of the pre-curing lamp 10. The light of the pre-curing lamp 10 always only shines on the surface of the battery to be printed or is blocked by the side wall of the light shielding tube 11 or the light shielding plate 13, avoiding the light from shining on other components and reflecting to the adjacent nozzle 4, which can well protect the nozzle from blockage caused by miscuring.

[0034] The contents explained in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the invention, and are not used to limit the scope of the invention. After reading the present invention, various equivalent forms of modifications to the embodiments by those skilled in the art fall within the scope defined by the claims attached to the present invention.

Claims

1. An inkjet printing system, comprising an inkjet printing device and a product to be printed (1), wherein the inkjet printing device is provided with a bottom plate (3), the bottom plate (3) is provided with a first mounting hole (11) for mounting a pre-fixing lamp (10), and the nozzle (4) is arranged on the upstream side of the pre-fixing lamp (10); characterized in that: The pre-curing lamp (10) is arranged in a light-shielding tube (11), and the side wall of the light-shielding tube (11) is provided with at least one first light-transmitting hole (7) along the circumferential direction, and the relative position between the light source emitting surface of the pre-curing lamp (10) and the first light-transmitting hole (7) is adjustable; a light-shielding plate (13) is provided at the bottom of the first mounting hole (11), and the light-shielding plate (13) is fixedly connected to the bottom plate (3), and a second light-transmitting hole (8) is provided on the light-shielding plate (13); by adjusting the relative position between the light source emitting surface of the pre-curing lamp (10) and the first light-transmitting hole (7), during the pre-curing process of the product (1), the light emitted by the pre-curing lamp (10) is directed toward the side wall of the light-shielding tube (11) or the light-shielding plate (13), or the light emitted by the pre-curing lamp (10) passes through the first light-transmitting hole (7) and the second light-transmitting hole (8) and is directed toward the surface to be printed on the product (1).

2. The inkjet printing system according to claim 1, characterized in that: The inkjet printing system is also provided with a driving mechanism (5), the output end of which is connected to a light-shielding cylinder (11), which is arranged along the width direction of the base plate (3); driven by the driving mechanism (5), the light-shielding cylinder (11) can rotate around its axis.

3. The inkjet printing system according to claim 2, characterized in that: The shape and size of the second light-transmitting hole (8) respectively match the shape and size of the projection of the surface to be printed of the product (1) on the bottom plate (3); the first light-transmitting hole (7) and the second light-transmitting hole (8) have the same shape, and the size of the first light-transmitting hole (7) is not larger than the size of the second light-transmitting hole (8); when the first light-transmitting hole (7) rotates to the bottom of the light-shielding cylinder (11) and the product (1) moves to the bottom of the pre-fixing lamp (10), the first light-transmitting hole (7), the second light-transmitting hole (8) and the projection of the surface to be printed of the product (1) on the bottom plate (3) overlap.

4. The inkjet printing system according to claim 3, characterized in that: The light source of the pre-fixing lamp (10) is located above the second light-transmitting hole (8), and the rotation speed and direction of the light-shielding tube (11) respectively match the moving speed and direction of the product (1); when the product (1) moves from the edge of one side of the second light-transmitting hole (8) to below the pre-fixing lamp (10) in the direction of the pre-fixing lamp (10), the amount of light from the pre-fixing lamp (10) received by the surface to be printed of the product (1) gradually increases; thereafter, when the product (1) continues to move downstream, the amount of light from the pre-fixing lamp (10) received by the surface to be printed of the product (1) gradually decreases until the light from the pre-fixing lamp (10) is blocked by the light-shielding tube (11).

5. The inkjet printing system according to any one of claims 2 to 4, characterized in that: The driving mechanism (5) comprises a motor (501), a first gear (502) arranged on the output end of the motor (501), and a second gear (503) meshing with the first gear (502); the end of the light-shielding tube (11) is connected to the end of the second gear (503); preferably, the light-shielding tube (11) and the second gear (503) as well as the light-shielding plate (13) and the bottom plate (3) are all detachably fixedly connected.

6. The inkjet printing system according to claim 5, characterized in that: The pre-fixed lamp (10) is connected to the fixing plate (6) via a first fixing member (12); the first fixing member (12) passes through the axis of the second gear (503); the motor (501), the first gear (502) and the second gear (503) are all connected to the fixing plate (6); and the bottom of the fixing plate (6) is fixedly connected to the base plate (3).

7. The inkjet printing system according to claim 5, characterized in that: A groove (14) is provided between two adjacent first light-transmitting holes (7) on the side wall of the outer end of the light-shielding tube (11); a groove-type photoelectric switch (9) is provided on the bottom plate (3); the sensing end of the groove-type photoelectric switch (9) is slidably connected to the side wall of the outer end of the light-shielding tube (11); the groove-type photoelectric switch (9) is electrically connected to the motor (501); when the motor (501) drives the light-shielding tube (11) to move until the groove (14) is located in the sensing end of the groove-type photoelectric switch (9), the motor (501) stops driving the light-shielding tube (11).

8. The inkjet printing system according to claim 7, characterized in that: A photoelectric sensor (2) is provided on the outer side of the upstream end of the bottom plate (3); the photoelectric sensor (2), the nozzle (4), the motor (501) and the slot-type photoelectric switch (9) are all electrically connected to the control system.

9. The inkjet printing system according to claim 7, characterized in that: A plurality of the first light-transmitting holes (7) are provided, and the plurality of first light-transmitting holes (7) are evenly distributed along the circumferential side wall of the light-shielding cylinder (11), and the distance between the groove (14) and two adjacent first light-transmitting holes (7) is equal.

10. The inkjet printing system according to claim 1, characterized in that: The distance between the center of the pre-fixing lamp (10) and the edge of the nozzle (4) on the inkjet printing device is no more than 90 mm.

11. The inkjet printing system according to claim 1, characterized in that: The shape and size of the first light-transmitting hole (7) and the second light-transmitting hole (8) can be adjusted according to the shape and size of the projection of the surface to be printed of the product (1) on the bottom plate (3).

Images