Doctor blade mechanism for printing curved objects

Abstract

The present invention relates to a doctor blade mechanism for printing curved objects, which is characterized by including a printing beam, a motor driving device, a fixed frame, a moving frame, a transmission device, a pressure sensing structure, a fixed clamp structure, a connecting structure and a printing rubber blade; the fixed frame is installed on the printing beam and can rotate, and the motor driving device is installed on the corresponding fixed frame; the moving frame is installed on the corresponding fixed frame and can move up and down, the transmission device is installed on the corresponding moving frame and fixed frame, and the motor driving device drives the moving frame to move or position through the transmission device; the upper end of the pressure sensing structure is installed on the corresponding moving frame, and the fixed clamp structure is installed at the lower end of the corresponding pressure sensing structure and can swing; both ends of the connecting structure are respectively installed between adjacent two fixed clamp structures, and the upper part of the printing rubber blade is installed on the fixed clamp structure. Its advantages are: the printed pattern is clear, the ink thickness is uniform, and the finished product rate is high.

Description

Technical Field

[0001] The present invention relates to a doctor blade mechanism for printing curved objects. Background Art

[0002] With the continuous improvement of the economic level, consumers' requirements for the aesthetics and comfort of items are increasing day by day. At present, in various fields, parts with curved surface shapes are widely used, bringing different usage experiences and visual aesthetics to existing products. For example, products using curved glass can make the products more beautiful and technological.

[0003] Using a curved object as the shape of the part's appearance can increase the aesthetics and strength of the product. For example, automotive sunroof glass (replacing the roof sheet metal). However, when it is necessary to screen-print patterns on the glass (such as adding ambient lights, etc.), the curved state of the glass will cause difficulties in printing. This is because the glass needs to be bent and formed under high-temperature conditions, while most special functional printing inks are not resistant to high temperatures. Therefore, most glass needs to be printed after being bent and formed. Currently, the printing process for curved glass generally involves sucking the glass flat into a plane and printing with the doctor blade in a straight line state. On the one hand, sucking the curved glass flat will cause uneven stress release, resulting in glass breakage and low product yield. On the other hand, if the glass reaches a certain thickness, it cannot be unfolded into a plane, otherwise it will completely break, and similar problems exist for components made of other materials with a curved surface, which greatly restricts the application of curved-shaped components in related industries. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a doctor blade mechanism for printing curved objects. When printing a curved object through this mechanism, the curved object only needs to be printed in its original curved state, and the printing doctor blade can make corresponding changes according to the curvature change of the surface of the curved object, becoming a curve, so that the printing doctor blade is completely attached to the curved object for printing. At this time, the pressure of the printing doctor blade on the surface of the curved object remains uniform, achieving the effects of clear printed patterns, uniform ink thickness, and high product yield.

[0005] To achieve the above purpose, the present invention is implemented as a doctor blade mechanism for printing curved objects, including:

[0006] A printing beam, a plurality of motor drive devices, and a plurality of fixing frames; the plurality of fixing frames are installed on the printing beam and can rotate, and the motor drive devices are installed on the corresponding fixing frames;

[0007] Multiple moving frames and multiple transmission devices; the moving frames are installed on corresponding fixed frames and can move up and down, the transmission devices are installed on corresponding moving frames and fixed frames and are cooperatively connected with the output ends of corresponding motor driving devices, and the motor driving devices drive the moving frames to move or be positioned through the transmission devices;

[0008] Multiple pressure sensing structures and multiple fixed clamp structures; the upper ends of the pressure sensing structures are installed on corresponding moving frames, and the fixed clamp structures are installed at the lower ends of corresponding pressure sensing structures and can swing;

[0009] Multiple connecting structures and a printing squeegee; both ends of the connecting structures are respectively installed between adjacent fixed clamp structures, and the upper part of the printing squeegee is installed on the fixed clamp structures.

[0010] In this technical solution, it further includes an intermediate fixed clamp, the upper end of the intermediate fixed clamp is installed on the connecting mechanism, and the upper part of the printing squeegee is installed on the intermediate fixed clamp.

[0011] In this technical solution, the pressure sensing structure includes a pressure sensor, a connecting sleeve and a connecting rod; the pressure sensor is installed at the bottom of the moving frame, the connecting sleeve is installed at the bottom of the moving frame and is located outside the pressure sensor, the top of the connecting rod is installed on the connecting sleeve and cooperates with the pressure sensor, and the fixed clamp structure is installed on the connecting rod.

[0012] In this technical solution, a mounting shaft is further provided on the connecting rod, the fixed clamp structure includes a connecting block and a fixed clamp, a through hole and a longitudinal square hole are provided on the connecting block, the connecting rod is arranged in the longitudinal square hole and can swing, the mounting shaft passes through the corresponding through hole and can swing, the fixed clamp is installed on the connecting block, and the upper part of the printing squeegee is installed on the fixed clamp.

[0013] In this technical solution, the connecting rod can swing and move left and right in the longitudinal square hole, and the mounting shaft can swing and move left and right in the through hole.

[0014] In this technical solution, the connecting structure further includes an elastic connecting plate, both ends of the elastic connecting plate are respectively installed on adjacent fixed clamp structures, the intermediate fixed clamp is installed at the bottom of the elastic connecting plate, and the upper part of the printing squeegee is installed on the intermediate fixed clamp.

[0015] In this technical solution, the transmission device includes a lead screw and a lead screw nut, the lead screw is installed on the moving frame and the fixed frame and can rotate, the lead screw nut is installed on the moving frame, the lead screw cooperates with the lead screw nut, and the output end of the motor driving device is connected to the lead screw, and the motor driving device drives the moving frame to move through the lead screw.

[0016] In this technical solution, a guide rail is provided on the fixed frame, and a sliding groove is provided on the moving frame. The sliding groove is slidably engaged with the guide rail.

[0017] In this technical solution, the transmission device includes a driving wheel, a driven wheel and a conveyor belt. The driving wheel and the driven wheel are installed on the fixed frame and are rotatable. The conveyor belt is fixedly engaged with the moving frame. The driving wheel and the driven wheel are connected and driven by the conveyor belt. The motor driving device drives the conveyor belt and the moving frame to move or be positioned through the driving wheel and the driven wheel.

[0018] In this technical solution, the transmission device includes a gear and a rack. The gear is installed on the fixed frame and is rotatable. The rack is installed on the moving frame. The gear is engaged with the rack. The motor driving device drives the gear to rotate, thereby driving the moving frame to move longitudinally or be positioned.

[0019] The advantages of the present invention compared with the prior art are as follows: printing of curved objects is achieved through this mechanism. The curved objects are printed while maintaining their original curved states without being flattened, thus preventing damage caused by flattening the curved objects. The printing squeegee fits perfectly with the surface of the curved objects, and the pressure of the printing squeegee on the curved objects is uniform. The yield rate and product quality are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a perspective view of the present invention;

[0021] Figure 2 is Figure 1 a perspective view in the left viewing position;

[0022] Figure 3 is a perspective view of the cooperation of the motor driving device, the fixed frame, the moving frame, the transmission device, the pressure sensing structure and a plurality of fixed clip structures of the present invention;

[0023] Figure 4 is Figure 2 the top view of;

[0024] Figure 5 is Figure 4 the A-A cross-sectional view of;

[0025] Figure 6 is Figure 4 the B-B cross-sectional view of;

[0026] Figure 7 is Figure 3 the exploded view of;

[0027] Figure 8 is Figure 3 the structural schematic diagram of;

[0028] Figure 9 is Figure 8Enlarged view of part A;

[0029] Figure 10 is Figure 1 Usage state diagram in the working state;

[0030] Figure 11 is the assembled perspective view of the motor drive device, fixed frame, movable frame, pulley and conveyor belt drive device, and pressure sensing structure of the second method of the present invention;

[0031] Figure 12 is the assembled perspective view of the motor drive device, fixed frame, movable frame, gear and rack drive device, and pressure sensing structure of the third method of the present invention. Embodiment

[0032] The following further describes the specific embodiments of the present invention with reference to the accompanying drawings. It should be noted here that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation to the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] In the description of the present invention, the orientation or positional relationship indicated by terms such as "upper", "lower", "left" and "right" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0034] In the present invention, unless otherwise clearly defined and limited, terms such as "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or a detachable setting or integration; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, which can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] As Figure 1 and Figure 12 shown, it is a doctor blade mechanism for printing curved objects, including:

[0036] Printing beam 1, a plurality of motor drive devices 2 and a plurality of fixed frames 3; a plurality of the fixed frames 3 are installed on the printing beam 1 and can rotate, and the motor drive devices 2 are installed on the corresponding fixed frames 3;

[0037] A plurality of moving frames 5 and a plurality of transmission devices 4; the moving frames 5 are installed on the corresponding fixed frames 3 and can move up and down, the transmission devices 4 are installed on the corresponding moving frames 5 and fixed frames 3 and are cooperatively connected with the output ends of the corresponding motor driving devices 2, and the motor driving devices 2 drive the moving frames 5 to move or be positioned through the transmission devices 4;

[0038] A plurality of pressure sensing structures 10 and a plurality of fixed clamp structures 6; the upper ends of the pressure sensing structures 10 are installed on the corresponding moving frames 5, and the fixed clamp structures 6 are installed at the lower ends of the corresponding pressure sensing structures 10 and can swing;

[0039] A plurality of connecting structures 8 and a printing squeegee 7; both ends of the connecting structures 8 are respectively installed between adjacent two fixed clamp structures 6, and the upper part of the printing squeegee 7 is installed on the fixed clamp structures 6.

[0040] During operation, according to the mathematical model of the curved object or the actually measured curved surface data, the operation curve of each motor driving device can be derived. The motor driving device 2 drives the corresponding moving frame 5 to move up and down by a corresponding displacement through the transmission device 4. When each moving frame 5 moves to the corresponding position of the curved object, under the action of the downward pressure of the fixed clamp structure 6, the printing squeegee 7 will be bent into a curve corresponding to the cross-sectional position of the curved object. As a result, the printing squeegee 7 completely fits the object surface for scraping printing, and under the condition that the pressure sensing structure 10 senses the corresponding pressure at each measurement point, the printing squeegee 7 has a uniform surface pressure on the curved object, clear patterns, and a high finished product rate.

[0041] In this embodiment, an intermediate fixed clamp 9 is further included. The upper end of the intermediate fixed clamp 9 is installed on the connecting mechanism 8, and the upper part of the printing squeegee 7 is installed on the intermediate fixed clamp 9. The intermediate fixed clamp 9 further ensures the bending degree of the printing squeegee 7, so that the printing squeegee 7 better fits the curved surface.

[0042] In this embodiment, the pressure sensing structure 10 includes a pressure sensor 101, a connecting sleeve 102 and a connecting rod 103; the pressure sensor 101 is installed at the bottom of the moving frame 5, the connecting sleeve 102 is installed at the bottom of the moving frame 5 and is located outside the pressure sensor 101, the top of the connecting rod 103 is installed on the connecting sleeve 102 and cooperates with the pressure sensor 101, and the fixed clamp structure 6 is installed on the connecting rod 103.

[0043] During operation, the corresponding pressure value is set according to the printing process of the product. The motor drive device 2 is controlled by an operating curve, and drives the corresponding moving frame 5 to move up and down by a corresponding displacement through the transmission device 4. After each moving frame 5 moves by a corresponding displacement, the printing squeegee 7 forms a curve shape corresponding to the curvature of the curved glass and presses on the glass for scraping. The pressure sensor 101 feeds back the real-time signal of the pressure value at each measurement point to the control unit, and the control unit makes corresponding fine adjustments to the motor drive device 2 and drives the transmission device to adjust the printing squeegee pressure, so that the pressure of the printing squeegee 7 is maintained within a constant value range, realizing the closed-loop control of pressure regulation, ensuring the pressure uniformity during printing, and greatly improving the product quality.

[0044] In this embodiment, an installation shaft 104 is further provided on the connecting rod 103. The fixed clip structure 6 includes a connecting block 61 and a fixed clip 62. A through hole 611 and a longitudinal square hole 612 are provided on the connecting block 61. The connecting rod 103 is arranged in the longitudinal square hole 612 and can swing, and the installation shaft 104 passes through the corresponding through hole 611 and can swing. The fixed clip 62 is installed on the connecting block 61, and the upper part of the printing squeegee 7 is installed on the fixed clip 62.

[0045] The connecting rod 103 swings left and right in the longitudinal square hole 612, so that the fixed clip structure 6 will swing left and right with the change of the curved surface, further making the printing squeegee 7 fit the printing curved surface better and the printing effect better.

[0046] In this embodiment, the connecting rod 103 can swing and move left and right in the longitudinal square hole 612, and the installation shaft 104 can swing and move left and right in the through hole 611.

[0047] The connecting rod 103 is arranged in the longitudinal hole 612 and can swing and move left and right, and the installation shaft 104 can rotate and move left and right in the through hole 611; thus, the fixed clip structure 6 can be flexibly adjusted in position according to the curved surface condition of the object, making the printing squeegee 7 fit the surface of the curved object better, with a better printing effect and a high yield.

[0048] In this embodiment, the connection structure 8 further includes an elastic connecting plate. The two ends of the elastic connecting plate 8 are respectively installed on adjacent fixed clip structures 6, the middle fixed clip 9 is installed at the bottom of the elastic connecting plate 8, and the upper part of the printing squeegee 7 is installed on the middle fixed clip 9.

[0049] In this embodiment, the transmission device 4 includes a lead screw 41 and a lead screw nut 42. The lead screw 41 is installed on the moving frame 5 and the fixed frame 3 and can rotate. The lead screw nut 42 is installed on the moving frame 5. The lead screw 41 cooperates with the lead screw nut 42, and the output end of the motor drive device 2 is connected to the lead screw. The motor drive device 2 drives the moving frame 5 to move through the lead screw.

[0050] In this embodiment, a guide rail 31 is provided on the fixing frame 3, and a sliding groove 51 is provided on the moving frame 5. The sliding groove 51 is slidably engaged with the guide rail 31.

[0051] In this embodiment, the transmission device 4 includes a driving wheel, a driven wheel and a conveyor belt. The driving wheel and the driven wheel are installed on the fixing frame 3 and are rotatable. The conveyor belt is fixedly engaged with the moving frame 5. The driving wheel and the driven wheel are connected and driven by the conveyor belt. The motor driving device 2 drives the conveyor belt and the moving frame 5 to move or be positioned through the driving wheel and the driven wheel, as Figure 11 shown.

[0052] In this embodiment, the transmission device 4 includes a gear and a rack. The gear is installed on the fixing frame 3 and is rotatable. The rack is installed on the moving frame 5. The gear meshes with the rack. The motor driving device 2 drives the gear to rotate, thereby driving the moving frame 5 to move longitudinally or be positioned, as Figure 12 shown.

[0053] There are also various forms of the transmission method of the transmission device 4, including but not limited to the above-mentioned lead screw transmission, pulley and conveyor belt transmission, and gear and rack transmission structures.

[0054] The above has made a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. However, the present invention is not limited to the described embodiments. For those of ordinary skill in the art, various changes, modifications, substitutions, and deformations of these embodiments still fall within the protection scope of the present invention without departing from the principles and purposes of the present invention.

Claims

1. A doctor blade mechanism for printing curved objects, characterized in that Including, a printing beam (1), a plurality of motor driving devices (2) and a plurality of fixing brackets (3); the plurality of fixing brackets (3) are installed on the printing beam (1) and are rotatable, and the motor driving devices (2) are installed on the corresponding fixing brackets (3); a plurality of moving brackets (5) and a plurality of transmission devices (4); the moving brackets (5) are installed on the corresponding fixing brackets (3) and are movable up and down, and the transmission devices (4) are installed on the corresponding moving brackets (5) and fixing brackets (3) and are cooperatively connected with the output ends of the corresponding motor driving devices (2), and the motor driving devices (2) drive the moving brackets (5) to move or be positioned through the transmission devices (4); a plurality of pressure sensing structures (10) and a plurality of fixing clamp structures (6); the upper ends of the pressure sensing structures (10) are installed on the corresponding moving brackets (5), and the fixing clamp structures (6) are installed at the lower ends of the corresponding pressure sensing structures (10) and are swingable; a plurality of connecting structures (8) and a printing squeegee (7); the two ends of the connecting structures (8) are respectively installed between adjacent fixing clamp structures (6), and the upper part of the printing squeegee (7) is installed on the fixing clamp structures (6); an intermediate fixing clamp (9); the upper end of the intermediate fixing clamp (9) is installed on the connecting structure (8), and the upper part of the printing squeegee (7) is installed on the intermediate fixing clamp (9); the pressure sensing structure (10) includes a pressure sensor (101), a connecting sleeve (102) and a connecting rod (103); the pressure sensor (101) is installed at the bottom of the moving bracket (5), the connecting sleeve (102) is installed at the bottom of the moving bracket (5) and is located outside the pressure sensor (101), the top of the connecting rod (103) is installed on the connecting sleeve (102) and cooperates with the pressure sensor, and the fixing clamp structure (6) is installed on the connecting rod (103); an installation shaft (104) is further provided on the connecting rod (103), the fixing clamp structure (6) includes a connecting block (61) and a fixing clamp (62), a through hole (611) and a longitudinal square hole (612) are provided on the connecting block (61), the connecting rod (103) is arranged in the longitudinal square hole (612) and is swingable, the installation shaft (104) passes through the corresponding through hole (611) and is swingable, the fixing clamp (62) is installed on the connecting block (61), and the upper part of the printing squeegee (7) is installed on the fixing clamp (62); the connecting structure (8) is an elastic connecting plate, the two ends of the elastic connecting plate are respectively installed on adjacent fixing clamp structures (6), and the intermediate fixing clamp (9) is installed at the bottom of the elastic connecting plate.

2. The doctor blade mechanism for printing on a curved object according to claim 1, characterized in that The connecting rod (103) is swingable and movable left and right in the longitudinal square hole (612), and the installation shaft (104) is swingable and movable left and right in the through hole (611).

3. The doctor blade mechanism for printing on a curved object according to claim 1, characterized in that The transmission device (4) includes a lead screw (41) and a lead screw nut (42). The lead screw (41) is installed on the moving frame (5) and the fixed frame (3) and is rotatable. The lead screw nut (42) is installed on the moving frame (5). The lead screw (41) cooperates with the lead screw nut (42). The output end of the motor driving device (2) is connected to the lead screw, and the motor driving device (2) drives the moving frame (5) to move through the lead screw.

4. The doctor blade mechanism for printing on a curved surface object according to claim 1, characterized in that A guide rail (31) is provided on the fixed frame (3), and a sliding groove (51) is provided on the moving frame (5). The sliding groove (51) is in sliding cooperation with the guide rail (31).

5. The doctor blade mechanism for printing on a curved surface object according to claim 1, characterized in that The transmission device (4) includes a driving wheel, a driven wheel and a conveyor belt. The driving wheel and the driven wheel are installed on the fixed frame (3) and are rotatable. The conveyor belt is fixedly fitted with the moving frame (5). The driving wheel and the driven wheel are connected and driven by the conveyor belt. The motor driving device (2) drives the conveyor belt and the moving frame (5) to move or be positioned through the driving wheel and the driven wheel.

6. The doctor blade mechanism for printing a curved object according to claim 1, wherein The transmission device (4) includes a gear and a rack. The gear is installed on the fixed frame (3) and is rotatable. The rack is installed on the moving frame (5). The gear meshes with the rack. The motor driving device (2) drives the gear to rotate so as to drive the moving frame (5) to move longitudinally or be positioned.

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