CN-122008715-A - SINGLEPASS mode-based spherical printing method and system

Abstract

The invention provides a spherical printing method and a system based on SINGLEPASS mode, which are based on SINGLEPASS printing mode, after spherical mapping is carried out on an original two-dimensional plane image, printing data are segmented according to the printing width and the eclosion width of a spray head, and the spray head position on the top of a sphere is kept motionless by combining the rotary motion of the sphere serving as a printing object along the central axis in the X-axis direction and the central axis in the Z-axis direction, and patterns with specified width are printed each time (Pass), and the operation is circulated until the whole spherical printing is completed. The invention can quickly and accurately realize spherical printing.

Inventors

• ZHANG JILONG
• LIU DAN
• WANG DONGBO

Assignees

• 深圳市印擎科技有限公司

Dates

Publication Date

20260512

Application Date

20260409

Claims (6)

1. 1. A spherical printing method based on SINGLEPASS mode is characterized in that after spherical mapping is carried out on an original two-dimensional plane image based on SINGLEPASS printing mode, data partitioning is carried out according to the printing width and the eclosion width of a spray head, the spray head position of a sphere serving as a printing object is kept motionless along the central axis of the X-axis direction and the central axis of the Z-axis direction, patterns with specified width are printed per Pass, and the circular operation is carried out until the whole spherical printing is completed.
2. 2. The SINGLEPASS mode-based spherical printing method according to claim 1, including the steps of: Step 1, determining the diameter d of a sphere to be printed; step 2, performing three-dimensional spherical mapping conversion treatment on the pre-printed image according to the diameter d, so that the mapped and converted image completely covers the spherical surface of the whole sphere; Step 3, obtaining printing data of the whole spherical area through mapping conversion processing in the step 2, and obtaining binary lattice data supported by a printing nozzle after RIP processing is carried out on the printing data; step4, performing block and edge eclosion treatment on the spherical data according to the width of the spray head and the set eclosion width to obtain print data per Pass and total printing times; Setting: The width of the spray head is W h ; the eclosion width is W ecl ; Sphere radius R Total number of printing times N Then n=roundup ((pi×r)/(W h -W ecl )), ROUNDUP is a carry rounding function; step 5, placing the spray head on the top of the sphere and keeping the spray head still, clamping the sphere left and right by a clamp in the left and right direction, loosening the clamp in the vertical direction at the moment, rotating the sphere one circle along the central axis in the X direction, synchronously printing the spray head when the sphere rotates, and just printing the current Pass data after rotating one circle; And 6, supporting the ball body by the clamps in the up-down direction along the vertical direction, loosening the clamps in the left-right direction at the moment, horizontally rotating along the central axis in the Z direction by a specified distance, wherein the rotating distance is equal to the width of the spray head minus the eclosion width, namely W h -W ecl , and then returning to the step 5 to enter the next Pass printing until all Pass printing is finished, namely finishing the ball body image printing.
3. 3. The SINGLEPASS mode-based spherical printing method according to claim 1, wherein in step 2: The plane coordinate points (x, y) are directly converted into spherical rectangular system coordinate formulas as follows: X=R*cos(πy/H-π/2)*cos(2πx/W-π) Y=R*cos(πy/H-π/2)*sin(2πx/W-π) Z=R*sin(πy/H-π/2) R=d/2; Wherein: The X, Y and Z are spherical rectangular coordinates, W and H are pixel values of the width and the height of the two-dimensional plane image respectively; According to the plane pixel coordinates (X, Y) of the two-dimensional plane image, the printing coordinates (X, Y, Z) of each point mapped to the sphere can be calculated, corresponding plane image data is obtained according to the printing coordinates of the sphere, and the plane image data is mapped to the corresponding position of the sphere for printing.
4. 4. A SINGLEPASS mode-based spherical printing system comprising a printing device and a fixture that support SINGLEPASS; The fixture comprises a left fixture, a right fixture and a vertical fixture, wherein the left fixture and the right fixture are used for driving a ball to be printed to rotate along an X axis, the vertical fixture is used for driving the ball to be printed to rotate along a Z axis, and the left fixture and the right fixture are in two states of clamping and loosening; a printing apparatus prints a preset image on a sphere under the action of a jig based on the method of any one of claims 1 to 3.
5. 5. The SINGLEPASS mode-based spherical printing system as in claim 4, wherein, The clamp comprises a base (1), a left clamp, a right clamp and a vertical clamp; the left clamp and the right clamp comprise a left support column (14), a right support column (5), an X-axis rotary driving motor (12), an air cylinder (8), a left clamping head (11) and a right clamping head (7); The left clamping head and the right clamping head are positioned on the same horizontal plane, the left clamping head and the right clamping head can clamp the sphere along the X axis direction after the air cylinder acts, and the sphere can be driven to rotate along the X axis after the X axis rotation driving motor is started; The vertical clamp comprises a lifting mechanism (2), a Z-axis rotary driving motor (3) and a bottom supporting disk (4), wherein the lifting mechanism is arranged on a base, the Z-axis rotary driving motor is arranged on the lifting mechanism, and a rotating shaft of the Z-axis rotary driving motor is connected with the bottom supporting disk; when the Z-axis rotary driving motor acts, the Z-axis rotary driving motor can drive the ball body to rotate along the Z axis through the bottom supporting disc.
6. 6. The SINGLEPASS-mode-based spherical printing system according to claim 4, wherein the left or right collet is a slip-resistant rubber bucket or a torus.

Description

SINGLEPASS mode-based spherical printing method and system Technical Field The invention belongs to the technical field of printing, and relates to a SINGLEPASS-mode-based spherical printing method and system. Background The ink-jet printing refers to that ink drops are sprayed onto a printing material through nozzles on a spray head to obtain an image, and the multi-Pass scanning printing and SINGLEPASS printing are the most common two printing modes, namely the multi-Pass scanning printing refers to that each unit of the image to be printed can be printed through multiple interpolation and multiple coverage, and the SINGLEPASS printing mode refers to that each unit of the image to be printed can be printed only through one printing. Along with the rapid development of the ink-jet printing technology, the application industry of high-speed ink-jet digital printing equipment is wider and wider, and the demand for printing colored personalized patterns on the surfaces of football, basketball, volleyball and other spheres is also more and more. As is well known, at present, the ink jet printing is mainly applied to plane and cylindrical (cone) materials, and the research of performing full-width high-efficiency ink jet printing on the surfaces of three-dimensional spheres such as football is slow due to high technical difficulty and the like. Currently there are two main ways to print patterns on spheres by inkjet: (1) And the spray head performs scanning movement back and forth, the PASS number is high, the printing precision is high, the printing device is suitable for proofing, but the speed is low, joints exist, and the printing device is not suitable for mass production. (2) SINGLEPASS printing, namely fixing the spray head, and having high printing efficiency and high speed. If a single (row of) spray heads are used, the width of the spray heads is limited (the height from the spray heads to the spherical surface is different because the spherical surface is arc-shaped, so that the width of the printing spray heads is not too wide), the whole sphere cannot be covered by single printing, and only a partial area in the middle of the sphere can be printed. If the multiple spray heads are annularly arranged, the printing width of the multiple spray heads after splicing can be used for finishing printing the whole spherical surface at one time, so that the equipment cost is overlarge, the equipment installation and debugging are very complex, the patterns are easy to produce joints, the printing device can only be suitable for printing the spherical body with the fixed size, and the printing device does not have the flexibility of production and application. Disclosure of Invention The invention aims to provide a spherical printing method and system based on SINGLEPASS mode, so as to realize efficient spherical surface. In order to achieve the above purpose, the specific hardware technical scheme adopted by the invention is as follows: A spherical printing method based on SINGLEPASS mode is based on SINGLEPASS printing mode, after spherical mapping is carried out on an original two-dimensional plane image, data blocking is carried out according to the printing width and the eclosion width of a spray head, the rotary motion of a ball body serving as a printing object along the central axis in the X-axis direction and the central axis in the Z-axis direction is combined, the spray head at the top of the ball body is kept stationary, patterns with specified widths are printed per Pass, and the operation is circulated until the whole spherical printing is completed. The method comprises the following steps: step 1, determining the diameter d of the ball to be printed, such as 216.5mm for standard football games Step 2, performing three-dimensional spherical mapping conversion treatment on the pre-printed image according to the diameter d, so that the mapped and converted image completely covers the spherical surface of the whole sphere; Step 3, obtaining printing data (single color or color) of the whole spherical area through mapping conversion processing in the step 2, and obtaining binary dot matrix data supported by a printing spray head after RIP (raster image processor) processing is carried out on the printing data; Step 4, carrying out block and edge eclosion treatment on the spherical data according to the width of the spray head and the set eclosion width to obtain print data per Pass and total printing times, wherein the spherical area (comprising symmetrical areas on the front surface and the back surface) corresponding to each piece of (1 Pass) print data is in a salix leaf shape with a wide middle and narrow two sides, and the position closest to the equator (the width of the spray head) is narrower as the position closer to the upper and lower poles; Setting: Width of nozzle W h Width of feathering W ecl Sphere radius R Total number of printing times N Then n=round up ((pi×r)/(W h-Wecl)), round up