Fan-shaped printing carriage for digital web printing presses

Abstract

The present invention relates to the technical field of inkjet printing equipment, specifically a folding fan-type inkjet printing trolley group for a digital printing machine for web printing, comprising a support frame, multiple groups of inkjet printing trolleys and a trolley drive mechanism arranged between the support frame and the inkjet printing trolley, the support frame comprising multiple trolley beams, two guide rails arranged at the bottom of the trolley beams, the trolley drive mechanism comprising a transmission screw and a trolley hanger, the trolley hanger comprising a sliding frame, multiple sliders arranged on the sliding frame and slidingly matched with the two guide rails, and a screw connection portion screwed to the transmission screw, the guide rails, the transmission screw and the trolley hanger cooperate to ensure the smooth operation of the inkjet printing trolley, thereby ensuring the parallelism between the nozzle base plate of the inkjet printing trolley and the printing medium and the printing accuracy of the printing nozzle. In addition, the folding fan-type inkjet printing trolley group of the present invention is provided with multiple groups of inkjet printing trolleys, and the multiple groups of inkjet printing trolleys are arranged in a fan shape, which can print on the circular arc surface printing medium.

Description

Technical Field

[0001] The invention relates to the technical field of inkjet printing equipment, in particular to a folding fan type inkjet printing trolley group of a digital printing press for web printing. Background Art

[0002] Digital printing is the digitization of printing technology, broadly referring to the partial or complete digitization of the entire process. A digital printer is a non-contact printing device in which the nozzles of a printhead selectively spray ink onto the print medium (substrate) at a constant speed. The interaction between the ink and the print medium forms a stable pattern on the print medium. Existing digital printers' print carriages include a printhead baseplate for mounting the printheads. Digital printers require high parallelism between the printhead baseplate and the print medium to ensure accurate printing and high-quality images. However, when a large number of printheads are installed in a print carriage and the printhead baseplate is large, the weight of the carriage increases, potentially causing the printhead baseplate to tilt. This creates a loss of perfect parallelism between the printhead baseplate and the print medium, making it difficult to ensure accurate placement of the printheads' jets. Furthermore, when the print medium is not horizontal but rather curved at an angle to the horizontal, existing digital printers' print carriages are not suitable for printing on curved surfaces. Summary of the Invention

[0003] The purpose of the present invention is to provide a fan-shaped printing carriage group for a digital printing press for web printing in order to solve the above problems.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a folding fan-type inkjet printing trolley group for a digital printing machine for web printing, comprising a support frame, multiple groups of inkjet printing trolleys and a trolley driving mechanism arranged between the support frame and the inkjet printing trolley, the support frame comprising a support frame, multiple guide rails arranged at the bottom of the support frame and two screw support plates connected and fixed at both ends of the support frame, the support frame comprising multiple trolley cross beams arranged horizontally, each trolley cross beam is provided with two guide rails along its length direction at the bottom, and the two guide rails are parallel to each other; the trolley driving mechanism comprises multiple motors installed on one of the screw support plates, multiple transmission screws rotatably connected between the two screw support plates and a trolley hanger arranged on each transmission screw, One end of the screw rod passes through the screw rod support plate and is connected to the output shaft of the motor; the trolley hanger includes a sliding frame, a plurality of sliders arranged on the top of the sliding frame and two screw connections arranged at both ends of the sliding frame, the plurality of sliders slide with the two guide rails at the bottom of the trolley cross beam, and the screw connection is connected to the transmission screw rod through a threaded connection; the multiple groups of printing trolleys are arranged in a fan shape, and each group of printing trolleys includes two sliding side plates, a trolley box sandwiched between the two sliding side plates, and a plurality of printing nozzles installed on the inside of the trolley box. The tops of the two sliding side plates are connected and fixed to the sliding frame of the trolley hanger, and the bottom of the trolley box is provided with a nozzle bottom plate, and the bottom surface of the nozzle bottom plate is the printing surface. The printing surfaces of the multiple groups of printing trolleys are arranged into an arc surface.

[0005] On the basis of the above technical solution, the present invention can also be improved as follows:

[0006] Furthermore, the multiple trolley cross beams are arranged side by side and located in the same plane, and the multiple trolley cross beams are connected by multiple steel plates, and the steel plates and the trolley cross beams are fixed by welding or screws.

[0007] Furthermore, a plurality of drag chains are connected between one of the screw support plates and the multiple groups of printing trolleys, and lines and pipes are provided inside the drag chains. The trolley hanger also includes a drag chain groove provided at the bottom of the sliding frame, and the drag chain groove is used to accommodate the drag chain. One end of the drag chain passes through the drag chain groove at the bottom of the sliding frame and is connected to the printing trolley.

[0008] Furthermore, a drag chain guide wheel and a drag chain guide wheel bracket are provided on the top of the trolley box and between the sliding side plates, and the drag chain guide wheel on the trolley box is abutted against the bottom of the drag chain.

[0009] Furthermore, the number of the sliders is set to four, and the four sliders are slidably engaged with the two guide rails at the bottom of the trolley crossbeam, each guide rail is slidably engaged with two of the sliders, and each slider is provided with a sliding groove that slides with the guide rail, and the two sides of the guide rail are recessed inward and are stuck in the sliding groove of the slider.

[0010] Furthermore, the printing surfaces of the multiple groups of printing carriages are arranged to form an arc surface with a high middle and low sides. The arc surface is based on a circle with a radius of 2 meters, and the arc between the printing surfaces of two adjacent printing carriages is 6 degrees.

[0011] Furthermore, guide keys are provided on both sides of the sliding frame, and guide grooves corresponding to the guide keys are provided on the inner sides of the tops of the two sliding side plates, and the guide keys of the sliding frame are correspondingly embedded in the guide grooves of the two sliding side plates.

[0012] Furthermore, the sliding side panel is provided with an inspection window and an observation window, and the inspection window is installed with an acrylic decorative panel.

[0013] Furthermore, the printing carriage also includes a control circuit board installed inside the carriage body, the control circuit board is connected to the printing nozzle through a data line, a photoeye is provided on the printing surface for sensing the position below the printing nozzle, and a water-cooled radiator is connected to the control circuit board.

[0014] Furthermore, the motor is a servo motor, and the threaded connection portion is a nut connected and fixed to both ends of the sliding frame.

[0015] The beneficial effects of the present invention are as follows: since two mutually parallel guide rails are provided at the bottom of the trolley crossbeam, the trolley drive mechanism includes a transmission screw and a trolley hanger provided on each transmission screw and fixed to the printing trolley, the trolley hanger includes a sliding frame, a plurality of sliders provided on the sliding frame and slidingly engaged with the two guide rails, and a screw connection portion provided at both ends of the sliding frame and screwed to the transmission screw, the smooth operation of the printing trolley can be ensured by cooperating with the guide rails, the transmission screw and the trolley hanger, thereby ensuring the parallelism between the nozzle base plate of the printing trolley and the printing medium and the printing accuracy of the printing nozzle. In addition, the folding fan-type printing trolley group of the present invention is provided with multiple groups of printing trolleys, which are arranged in a fan shape and can print on arc-surface printing media. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and examples.

[0017] Figure 1 This is a structural schematic diagram of a fan-shaped printing carriage assembly of a digital printing press for web printing provided by a preferred embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A front view of the fan-shaped printing carriage set;

[0019] Figure 3 yes Figure 1 A side view of the fan-shaped printing carriage set;

[0020] Figure 4 yes Figure 1Bottom view of the folding fan printing carriage assembly;

[0021] Figure 5 yes Figure 1 Structural diagram of the trolley hanger;

[0022] In the figure: 11. Drag chain; 12. Support frame; 122. Trolley crossbeam; 14. Guide rail; 16. Screw support plate; 20. Printing trolley; 21. Sliding side plate; 22. Trolley box; 221. Print head base plate; 222. Printing surface; 224. Drag chain guide wheel; 225. Drag chain guide wheel bracket; 23. Printing head; 24. Control circuit board; 241. Water cooling radiator; 25. Inspection window; 26. Observation window; 32. Drive screw; 34. Trolley hanger; 341. Sliding frame; 342. Slider; 343. Screw connection; 344. Drag chain slot; 345. Guide key; 36. Motor. DETAILED DESCRIPTION

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0026] like Figures 1 to 5As shown, a preferred embodiment of the present invention provides a fan-shaped printing carriage group for a digital printing machine for web printing, including a support frame, multiple groups of printing carriages 20 and a carriage driving mechanism arranged between the support frame and the printing carriage 20.

[0027] The support frame includes a support frame 12, multiple guide rails 14 provided at the bottom of the support frame 12, and two screw support plates 16 connected and fixed at both ends of the support frame 12. The support frame 12 includes multiple trolley beams 122 corresponding one to each of the multiple groups of printing carriages 20. The multiple trolley beams 122 are arranged side by side and located in the same plane. The multiple trolley beams 122 can be connected by multiple steel plates. The multiple steel plates and the multiple trolley beams 122 can be fixed by welding or screws. The trolley beams 122 are arranged horizontally, and each trolley beam 122 has two guide rails 14 provided at the bottom along its length. The two guide rails 14 are parallel to each other. Two screw support plates 16 are connected and fixed at both ends of the support frame 12 by screws. The trolley drive mechanism is provided between the two screw support plates 16, and the trolley drive mechanism drives the printing carriage 20 to move left and right along the guide rails 14. A plurality of drag chains 11 are connected between the screw support plate 16 on the left and the plurality of printing carriages 20 . The plurality of drag chains 11 move along with the printing carriages 20 . Circuits and pipelines are arranged inside the drag chains 11 to protect the internal circuits and pipelines.

[0028] The trolley driving mechanism includes multiple motors 36 installed on one of the screw support plates 16, multiple transmission screws 32 installed between the two screw support plates 16, and a trolley hanger 34 arranged on each transmission screw 32. The trolley hanger 34 can move left and right along the length direction of the transmission screw 32. The motors 36, transmission screws 32 and trolley hangers 34 correspond to the printing trolley 20 one by one, and the trolley hanger 34 is fixed to the top of the printing trolley 20.

[0029] Specifically, the multiple motors 36 are servo motors, and the multiple motors 36 correspond one-to-one to the multiple transmission screws 32. The two ends of each transmission screw 32 are rotatably connected to the two screw support plates 16, and one end of the transmission screw 32 passes through one of the screw support plates 16 and is connected to the output shaft of the motor 36.

[0030] Specifically, the trolley hanger 34 includes a sliding frame 341, a plurality of sliders 342 disposed at the top of the sliding frame 341, two screw-connecting portions 343 disposed at both ends of the sliding frame 341, and two drag chain slots 344 disposed at the bottom of the sliding frame 341. In this embodiment, the number of sliders 342 is set to four, and the four sliders 342 slide in conjunction with the two guide rails 14 at the bottom of the trolley crossbeam 122. Each guide rail 14 slides in conjunction with two of the sliders 342. Each slider 342 is provided with a sliding groove that slides in conjunction with the guide rail 14. The two sides of the guide rail 14 are recessed inwardly and fit into the sliding grooves of the sliders 342, thereby supporting and positioning the hanger 34. The screw-connecting portions 343 are threadedly connected to the transmission screw 32 and can move left and right along the transmission screw 32. The screw-connecting portions 343 can be nuts connected and fixed to both ends of the sliding frame 341. The drag chain groove 344 is used to accommodate the drag chain 11. One end of the drag chain 11 passes through the two drag chain grooves 344 at the bottom of the sliding frame 341 in sequence and is connected to the printing carriage 20. The part of the drag chain 11 located between the screw support plate 16 on the left and the drag chain groove 344 always remains horizontal during the movement of the printing carriage 20.

[0031] When the motor 36 is working, the transmission screw 32 rotates, and the rotation of the transmission screw 32 drives the screw connection portion 343 and the sliding frame 341 to move left and right along the transmission screw 32, thereby driving the printing carriage 20 connected to the carriage hanger 34 to move.

[0032] The printing carriages 20 are arranged in multiple groups. Each group of printing carriages 20 can move independently or simultaneously under the control of the carriage drive mechanism. The tops of the multiple groups of printing carriages 20 are connected and fixed to the carriage hangers 34 on the multiple drive screws 32. The multiple groups of printing carriages 20 are arranged in a front-to-back direction. In this embodiment, there are four groups of printing carriages 20, arranged in a fan-shaped pattern, each printing four colors.

[0033] Each printing carriage 20 is used to print various patterns on a paper roll and comprises two sliding side panels 21, a carriage housing 22 sandwiched between the two sliding side panels 21, multiple print heads 23 mounted inside the carriage housing 22, and a control circuit board 24. The tops of the two sliding side panels 21 are fixedly connected to the sliding frame 341 of the carriage hanger 34. In this embodiment, the sliding side panels 21 and carriage housing 22 are made of stainless steel.

[0034] Preferably, guide keys 345 are provided on both sides of the sliding frame 341, and guide grooves corresponding to the guide keys 345 are provided on the inner sides of the tops of the two sliding side plates 21. The guide keys 345 of the sliding frame 341 are correspondingly embedded in the guide grooves of the two sliding side plates 21, thereby positioning the sliding frame 341 between the two sliding side plates 21, and then fixing the sliding frame 341 between the two sliding side plates 21 by screws.

[0035] Preferably, the sliding side panel 21 is provided with an inspection window 25 and an observation window 26. The inspection window 25 is provided with an acrylic decorative plate, which can be opened when installation or maintenance is required for easy maintenance. The observation window 26 is provided to facilitate observation of the status of the printing nozzle 23 inside the printing carriage 20.

[0036] A nozzle base plate 221 is provided at the bottom of the trolley box 22, and the bottom surface of the nozzle base plate 221 is a printing surface 222. The printing surface 222 is perpendicular to the surface of the printed paper, and the printing surface 222 is parallel to the transmission screw 32 and the guide rail 14. The printing surface 222 is provided with multiple through holes corresponding to the multiple printing nozzles 23. The multiple printing nozzles 23 can be staggered. The printing nozzle 23 is the main component for realizing the digital printing function. Ink is ejected from the nozzle of the printing nozzle 23. The printing nozzle 23 can adopt an Epson S3200 nozzle.

[0037] Preferably, a drag chain guide wheel 224 and a drag chain guide wheel bracket 225 are provided on the top of the trolley box 22 and between the sliding side plates 21. The portion of the drag chain 11 located between the screw support plate 16 on the left and the drag chain groove 344 always remains horizontal during the movement of the printing trolley 20, and the drag chain guide wheel 224 on the trolley box 22 always rests against the bottom of the drag chain 11.

[0038] In order to adapt to the upwardly convex curved paper roll (printing medium) to be printed, the printing surfaces 222 of the multiple groups of printing carriages 20 are arranged into an arc surface, which is high in the middle and low on both sides. The arc surface is based on a circle with a radius of 2 meters. The arc between the printing surfaces 222 of two adjacent printing carriages 20 is 6 degrees.

[0039] The control circuit board 24 is connected to the print head 23 via a data line. The control circuit board 24 can control the inkjet of the print head 23 and the carriage drive mechanism to control the movement of the print head 23 and the printing carriage 20. The printing surface 222 can also be provided with a photocell for sensing the position below the print head 23. The photocell transmits the sensed position signal to the control circuit board 24.

[0040] Furthermore, the control circuit board 24 is connected to a water-cooling radiator 241 for cooling the control circuit board 24. The water-cooling radiator 241 is arranged inside the trolley body 22 and is connected to the cooling pump. The control circuit board 24 is closely attached to the water-cooling radiator 241. The control circuit board 24 generates heat during operation, and a malfunction will occur if the temperature cannot be reduced. Therefore, the control circuit board 24 is closely attached to the water-cooling radiator 241 to achieve a cooling effect. The cooling working principle is as follows: the cooling pump pumps coolant of a certain temperature into the water-cooling radiator 241 from the inlet of the water-cooling radiator 241. The cold water flows along the cooling channel in the water-cooling radiator 241, while lowering the temperature of the control circuit board 24 closely attached to the water-cooling radiator 241. The water then flows out from the outlet of the water-cooling radiator 241 and enters the cooling pump to be cooled again to a certain temperature, and the cycle repeats.

[0041] When the present invention is in use, the initial position of the printing carriage 20 is located at one end of the guide rail 14. During normal operation, the carriage drive mechanism drives the printing carriage 20 to move along the guide rail 14 and enter the appropriate position in the area where the paper roll to be printed is located. After the photoeye senses the position mark, it transmits the position signal to the control circuit board 24. The print head 23 on the printing carriage 20 receives the printing signal and starts printing. During the printing process, each group of printing carriages 20 will automatically track the position through the visual system to ensure that the printing position of the four groups of printing carriages 20 is accurate. After the printing is completed, the carriage drive mechanism drives the printing carriage 20 to move along the guide rail 14, so that the printing carriage 20 returns to the initial position.

[0042] Since two parallel guide rails 14 are provided at the bottom of the trolley crossbeam 122, the trolley drive mechanism includes a transmission screw 32 and a trolley hanger 34 provided on each transmission screw 32 and fixed to the printing trolley 20. The trolley hanger 34 includes a sliding frame 341, a plurality of sliders 342 provided on the sliding frame 341 and slidably engaged with the two guide rails 14, and screw connection portions 343 provided at both ends of the sliding frame 341 and screwed to the transmission screw 32. The cooperation of the guide rails 14, the transmission screw 32, and the trolley hanger 34 ensures the smooth operation of the printing trolley 20, thereby ensuring the parallelism between the nozzle base plate 221 of the printing trolley 20 and the printing medium, and the printing accuracy of the printing nozzle 23. In addition, the folding fan type printing trolley group of the present invention is provided with multiple groups of printing trolleys 20, which are arranged in a fan shape and can print on circular surface printing media.

[0043] Any matters not mentioned in the above specific embodiments of the present invention belong to the common knowledge in this field and can be implemented with reference to the common knowledge.

[0044] The above description is based on the ideal embodiment of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the content of the specification and must be determined according to the scope of the claims.

Claims

1. A fan-shaped printing carriage assembly for a digital printing press for web printing, characterized by: The invention comprises a support frame, multiple groups of printing trolleys and a trolley driving mechanism arranged between the support frame and the printing trolley, the support frame comprises a support frame, multiple guide rails arranged at the bottom of the support frame and two screw support plates connected and fixed at both ends of the support frame, the support frame comprises multiple trolley beams arranged horizontally, the multiple trolley beams are arranged side by side and located in the same plane, and two guide rails are provided at the bottom of each trolley beam along its length direction, and the two guide rails are parallel to each other; the trolley driving mechanism comprises multiple motors installed on one of the screw support plates, multiple rotatable A transmission screw connected between the two screw support plates and a trolley hanger arranged on each transmission screw, one end of the transmission screw passes through the screw support plate and is connected to the output shaft of the motor; the trolley hanger includes a sliding frame, a plurality of sliders arranged at the top of the sliding frame and two screw connections arranged at both ends of the sliding frame, the plurality of sliders slide with the two guide rails at the bottom of the trolley crossbeam, and the screw connections are connected to the transmission screw by threads; the multiple groups of printing trolleys are arranged in a fan shape, and each group of printing trolleys includes two sliding side plates, a plurality of sliders arranged between the two sliding plates, and a plurality of sliders arranged between the two sliding plates. The trolley box body between the side panels and the multiple printing nozzles installed on the inside of the trolley box body are fixedly connected to the sliding frame body of the trolley hanger. The bottom of the trolley box body is provided with a nozzle base plate, and the bottom surface of the nozzle base plate is the printing surface. The printing surfaces of the multiple groups of printing trolleys are arranged into an arc surface; multiple drag chains are connected between one of the screw support plates and the multiple groups of printing trolleys, and lines and pipelines are provided inside the drag chains. The trolley hanger also includes a drag chain groove provided at the bottom of the sliding frame, and the drag chain groove is used to accommodate the drag chain. One side of the drag chain The drag chain groove that passes through the bottom of the sliding frame is connected to the printing trolley; a drag chain guide wheel and a drag chain guide wheel bracket are provided on the top of the trolley box and between the sliding side panels, and the drag chain part between one of the screw support plates and the drag chain groove always remains horizontal during the movement of the printing trolley, and the drag chain guide wheel on the trolley box is always against the bottom of the drag chain; the printing surfaces of the multiple groups of printing trolleys are arranged into an arc surface that is high in the middle and low on both sides. The arc surface is based on a circle with a radius of 2 meters, and the curvature between the printing surfaces of two adjacent printing trolleys is 6 degrees.

2. The fan-shaped printing carriage assembly for a digital printing press for web printing according to claim 1, characterized in that: The multiple trolley cross beams are connected through multiple steel plates, and the steel plates are fixed to the trolley cross beams by welding or screws.

3. The fan-shaped printing carriage assembly for a digital printing press for web printing according to claim 1, characterized in that: The number of the sliders is set to four, and the four sliders are slidably matched with the two guide rails at the bottom of the trolley crossbeam, each guide rail is slidably matched with two of the sliders, and each slider is provided with a sliding groove that slides with the guide rail, and the two sides of the guide rail are recessed inward and are locked in the sliding groove of the slider.

4. The fan-shaped printing carriage assembly for a digital printing press for web printing according to claim 1, characterized in that: Guide keys are arranged on both sides of the sliding frame, and guide grooves corresponding to the guide keys are arranged on the inner sides of the tops of the two sliding side plates. The guide keys of the sliding frame are correspondingly embedded in the guide grooves of the two sliding side plates.

5. The fan-shaped printing carriage assembly for a digital printing press for web printing according to claim 1, characterized in that: The sliding side panel is provided with an inspection window and an observation window, and the inspection window is installed with an acrylic decorative panel.

6. The fan-shaped printing carriage assembly of a digital printing press for web printing according to claim 1, characterized in that: The printing carriage also includes a control circuit board installed inside the carriage body, the control circuit board is connected to the printing nozzle through a data line, a photoeye is provided on the printing surface for sensing the position below the printing nozzle, and a water-cooled radiator is connected to the control circuit board.

7. The fan-shaped printing carriage assembly for a digital printing press for web printing according to claim 1, characterized in that: The motor is a servo motor, and the threaded connection portion is a nut connected and fixed to both ends of the sliding frame.

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