Assembly of one object with a handle and one ink jet machine for printing the object

• US 9,630,398 B2
• Filed: 10/15/2015
• Issued: 04/25/2017
• Est. Priority Date: 10/20/2014
• Status: Active Grant

• Current Assignee: Machines Dubuit
• Original Assignee: Machines Dubuit
• Inventors: Dumenil, Francois, Dubuit, Jean-Louis
• Primary Examiner(s): Seo, Justin
• Application Number:
  US14/884,355
• Publication Number:
  US 20160107436A1
• Time in Patent Office: 558 Days
• CPC Class Codes: B41J 2/04505 aiming at correcting alignment
• CPC Class Codes: B41J 3/4073 Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects B41J3/283, B41J3/286 take precedence; building up a 3D object using individual droplets from jetting heads B29C64/112

Abstract

An assembly of at least one object and a machine for printing the object, the object having an outer surface substantially of revolution around an axis, and a handle. The machine includes four ink jet printheads, at least one object holder and a support on which the object holder is fastened. An actuator moves the support relative to the printheads in at least four print configurations, and the object holder drives rotation of the object around the axis in each printing configuration. A commander commands the object holder to rotate the object relative to the corresponding printhead around the axis from an initial printing position, in which the handle is located near the printhead on one side of the median plane of the printhead, to a final printing position, in which the handle is situated near the printhead on the other side of the median plane.

Claims

1. An assembly of at least one object and a machine for printing the object, the object having an outer surface substantially of revolution around an axis, and a handle protruding radially from the outer surface, the machine comprising:

at least four ink jet printheads, each printhead defining a median plane,

at least one object holder designed to hold the object and a support, the object holder being fastened on the support,

an actuator for moving the support relative to the printheads in at least four print configurations, the object in the at least four print configurations being respectively across from one of the printheads, the object holder being adapted to drive rotation of the object around the axis in each of the at least four printing configurations,

a commander for commanding the actuator, the object holder and the at least four printheads, the commander configured, in each of the at least four printing configurations, to command the object holder to rotate the object relative to the corresponding printhead around the axis from an initial printing position, in which the handle is located near the corresponding printhead on one side of the median plane of the corresponding printhead, to a final printing position, in which the handle is situated near the corresponding printhead on the other side of the median plane, the handle being moved relative to the corresponding printhead following a circular trajectory, others of the at least four printheads being positioned away from the circular trajectory of the handle, the median planes being distributed along a movement direction and substantially perpendicular to the movement direction, and

a drier for drying the ink, the dryer including a row of light emitting diodes.

2. The assembly as recited in claim 1 wherein:

each printhead includes a lower face designed to be across from the object, the lower face defining a thickness E in the movement direction,

the outer surface and the handle respectively define a small radius R1 and a large radius R2 of the object from the axis, and

two successive median planes are separated by a same distance greater than or equal to a minimum distance equal to the square root of the difference between the large radius R2 squared and the small radius R1 squared, plus half of the thickness E.

3. The assembly as recited in claim 2 wherein the distance is between the minimum distance plus 1 mm and the minimum distance plus 5 mm.

4. The assembly as recited in claim 1, wherein:

the initial printing position and the final printing position together define a nonprintable portion of the outer surface of the object, the nonprintable portion defining an angle relative to the axis, and

the commander is configured on the one hand to command the actuator so as to move the support from a first printing configuration chosen from among the printing configurations to a second printing configuration, and on the other hand to command the object holder so as to simultaneously rotate the object relative to the support around the axis by an angle equal to said angle, the movement of the support and the simultaneous rotation of the object causing the object to go from the final printing position relative to the corresponding printhead in the first printing configuration, to the initial printing position relative to the corresponding printhead in the second printing configuration.

5. The assembly as recited in claim 1 wherein the drier defines a median drying plane and is movable relative to the object holder between an active position, in which the drier is able to dry at least one layer of ink deposited on the object, and at least one inactive position, in which the drier is at a sufficient distance from the axis to allow the handle to pass when the object holder rotates the object around the axis.

6. The assembly as recited in claim 5 wherein the commander is able to place the drier in the active position and to command the object holder to rotate the object relative to the drier around the axis of an initial drying position, in which the handle is situated near the drier on one side of the median drying plane, to a final drying position, in which the handle is situated near the drier on the other side of the median drying plane, then to move the drier from the active position to the inactive position, the rotation of the object continuing around the axis during said movement of the drier.

7. The assembly as recited in claim 5 wherein the commander is able to move the drier from the active position to the passive position by translating the drier relative to the support substantially in the movement direction.

8. The assembly as recited in claim 5 further comprising a base extending in a movement direction and a plurality of driers including the drier mounted on the base perpendicular to the movement direction so as to form a rake, the base being mounted movably in the movement direction relative to the support, each drier being suitable for drying at least one layer of ink respectively deposited by one of the printheads, the commander being configured to move the base in the movement direction relative to the support and to command the object holder so as to simultaneously rotate the object relative to the support around the axis, the movement of the base and the simultaneous rotation of the object causing the object to go from the final drying position relative to one of the driers to the initial drying position relative to the other of driers.

9. The assembly as recited in claim 5 wherein the drier is mounted movably in the movement direction on the support successively from a first inactive position, designed to be occupied while the drier has not yet dried one or more layers deposited by one or more printheads;

toward the active position designed to be occupied when the drier is in the process of drying said layer of ink; and

then toward a second inactive position, different from the first inactive position and designed to be occupied when the drier has dried said layer of ink.

10. The assembly as recited in claim 9 wherein the commander is suitable for placing the drier in the active position while a single layer of non-dry ink has been deposited on the object, and to command the object holder so that the object performs an additional revolution relative to the support around the axis during which the object is not receiving ink and during which the drier goes from the second inactive position to the first inactive position.

11. The assembly as recited in claim 9 wherein the commander is suitable for placing the drier in the active position while a second layer of non-dry ink is deposited on a first layer of non-dry ink, and for commanding the object holder so as to perform substantially one additional revolution of the object relative to the support around the axis during which the object receives ink and during which the drier goes from the second inactive position to the first inactive position.

12. The assembly as recited in claim 1 wherein the circular trajectory of the handle is uniform.

13. The assembly as recited in claim 1 wherein the median planes are distributed regularly in the longitudinal direction.

14. A method for printing at least one object, the object including a substantially cylindrical outer surface around an axis, and a handle protruding radially from the outer surface, the method comprising at least the following steps:

providing a machine for printing the object, the machine comprising;

at least four ink jet printheads, each printhead defining a median plane, the median planes being distributed along a movement direction and substantially perpendicular to the movement direction;

at least one object holder and a support on which the object holder is fastened;

an actuator for actuating the support;

a commander for commanding the actuator, the object holder and the printheads; and

a drier for drying the ink, the dryer including a row of light emitting diodes;

carrying of the object by the object holder;

commanding the actuator via the commander and moving the support using the actuator relative to the printheads in at least four printing configurations in which the object is respectively across from one of the printheads;

in each printing configuration, commanding the object holder via the commander and rotating the object using the object holder around the axis from an initial printing position, in which the handle is situated near the printhead on one side of the median plane of the printhead, to a final printing position, in which the handle is situated near the printhead on the other side of the median plane, the handle being moved relative to the printhead along a circular trajectory, the others of the four printheads being positioned away from the circular trajectory of the handle; and

commanding the printheads via the commander.

15. The method as recited in claim 14 wherein the circular trajectory of the handle is uniform.