Printing device, adjustment method and printing method

A device for printing by means of screen printing an object having at least a conical portion, the conical portion having a conical center and a cone angle, the device comprising:

• a frame;
• a mobile screen relative to the frame, the screen having a mesh with a pattern to be printed on the conical portion of the object, the pattern having the shape of a conical evolute having a pattern center and an angular extent range of the pattern;
• a squeegee which is carried by the frame, the squeegee being capable of pressing the mesh of the screen against the conical portion of the object in order to apply the pattern to the conical portion of the object, wherein the device comprises:
• a driving means for rotating the screen around an axis of rotation, said driving means for rotating the screen comprising a single motor,
• a first displacement means of the motor for rotating the screen during the printing of the object, said first displacement means extending in a first direction,
• a second displacement means of the motor for rotating the screen during the printing of the object, said second displacement means extending in a second direction perpendicular relative to the first direction, the first displacement means carrying the second displacement means,
• wherein the first displacement means comprise a first slotted member which is fixedly joined to the frame and a first carriage which is guided in the first slotted member, the second displacement means comprising a second slotted member which is carried by the first carriage and a second carriage which is guided in the second slotted member, the second carriage carrying the means for rotatably driving the screen, and
• wherein the first displacement means and second displacement means are capable of allowing the first carriage and the second carriage to be moved manually relative to the frame in the first direction and second direction, respectively, the means for rotatably driving the screen are capable of allowing the screen to pivot manually about the rotation axis, further comprising:
• means for reading the position of the first carriage, the position of the second carriage and the rotation angle of the screen at a Cartesian reference point which is fixed relative to the frame,
• calculation means which are capable of calculating, from the positions read, the coordinates of the movement path of the first carriage and the second carriage and the rotation angles of the screen at the Cartesian reference point, and
• control means which are capable of controlling the movement of the first carriage, the second carriage and the rotation of the screen in accordance with the coordinates and the angles calculated.

A screen printing device to screen printing an object having at least a conical portion, the conical portion having a conical center and a cone angle, the device comprising:

• a frame (4);
• a driving device (6) carried by the frame (4) and movable relative to the frame (4), the driving device configured to rotatably drive an object (8) to be printed;
• a mobile printing screen (12), the screen having a mesh with a pattern to be printed on the conical portion of the object, the pattern having the shape of a conical evolute having a pattern center and an angular extent range of the pattern;
• a rotation system (10) to rotate the printing screen (12) relative to the frame (4);
• a squeegee which is carried by the frame, the squeegee configured to press the mesh of the screen against the conical portion of the object in order to apply the pattern to the conical portion of the object, wherein,
• the rotation system (10) is configured to rotate the screen around an axis of rotation, said rotation system (10) comprising a single motor, with i) a first displacement part of the motor rotating the screen during the printing of the object, said first displacement part extending in a first direction, and ii) a second displacement part of the motor rotating the screen during the printing of the object, said second displacement part extending in a second direction perpendicular relative to the first direction, the first displacement part carrying the second displacement part,
• wherein, the squeegee moves i) independent from the rotation system, and ii) independent from the first and second displacement parts of the motor for rotating the screen, so that i) the screen and not the squeegee is moved by the motor and by the first and second displacement parts, and ii) the squeegee is movable independently from the screen relative to the frame, only the screen being moved in rotation and in translation relative to the frame during printing of the object.