TWI414367B - Method for printing on a workpiece - Google Patents

Abstract

The prevent invention relates to a method for printing on a workpiece. The workpiece is positioned on a conveyer mechanism. An upper inkjet head prints on the upper surface of the workpiece. A first side inkjet head prints on the first side of the workpiece. The conveyer mechanism rotates the second surface of the workpiece to face a second side inkjet head. The second inkjet head prints on the second surface of the workpiece.

Description

Workpiece printing method

The invention relates to a spraying method, in particular to a workpiece printing method.

Generally, the outer casing of a consumer electronic product such as a mobile phone or a computer is painted by a paint surface to achieve the purpose of beautifying the outer casing. The traditional spray gun uses high-speed air to atomize the paint. The paint is atomized into a fine particle-like paint mist and then sprayed out from the nozzle of the spray gun. The air flow generated by the high-speed air is too strong, so that the spray gun cannot be too close to the workpiece. Otherwise, the paint that has been sprayed on the surface of the workpiece will be blown unevenly by the airflow generated by the high-speed air. Therefore, the spray gun needs to maintain a certain distance when spraying the workpiece. However, the distance between the spray gun and the workpiece will increase the range of the spray, and the paint that can be sprayed on the workpiece is only about 10% to 30%. About 70% to 90% of the paint is not sprayed on the workpiece to form waste paint. If it is necessary to spray a specific area or pattern on the workpiece, it is necessary to use a jig to cover the place where no spraying is required. After the spraying, the jig is removed, not only the spraying process is complicated, but also spraying in a specific area. The paint utilization rate is lower, and only about 10% of the paint can be sprayed on the workpiece. The paint utilization rate of this conventional painting method is too low, resulting in excessive waste of paint, making the paint cost high and not environmentally friendly.

In view of this, it is necessary to provide a method for painting a workpiece, which improves the utilization rate of the paint during spraying and makes the spraying process simpler and faster.

A workpiece printing method is applied to a top inkjet head, first and first The printing device of the two-side inkjet head and the conveying mechanism comprises the following steps: (1) placing the workpiece on the conveying mechanism; (2) printing the top surface of the workpiece by the top inkjet head; (3) the conveying mechanism will The first side of the workpiece is aligned with the first side inkjet head; (4) the first side inkjet head prints the first side of the workpiece; and (5) the transport mechanism aligns the second side of the workpiece with the second side The ink head; (6) the second side inkjet head prints the second side of the workpiece.

The workpiece printing method of the invention can be divided into a plurality of to-be-printed surfaces according to the printing range of the inkjet head or the shape of the workpiece, and the conveying mechanism can horizontally rotate the workpiece so that the side of the workpiece to be printed is aligned with the inkjet head. Print again, and the effect of continuous printing of the body workpiece can be achieved. Moreover, when the inkjet head of the printing device prints the workpiece, the ink paint can be completely sprayed on the surface of the workpiece, so that the utilization rate of the ink paint is greatly improved, and the cost is reduced and environmentally friendly.

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Referring to Fig. 1, a specific embodiment of the workpiece printing method of the present invention is applied to a lacquering apparatus 10, which includes a top inkjet head 20, opposing side inkjet heads 30, 40, and a transport mechanism 50. The inkjet head 20 is used to print graphics or text on the workpiece 60. The transport mechanism 50 is used to carry the workpiece 60 and can rotate the workpiece 60. The workpiece 60 has a top surface 61, two opposite first side surfaces 62 and two opposite second side surfaces 63. The first side surface 62 and the second side surface 63 are adjacent to each other. In this case, the printing range of the inkjet head or the shape of the workpiece can be divided into a plurality of sides to be printed, and the number of the side inkjet heads is set according to the number of the plurality of sides to be printed.

Referring to FIG. 2, a flow chart of a workpiece printing method, the steps included in the workpiece printing method are sequentially performed, and the following steps are included:

Step S1: The workpiece is placed on the conveying mechanism. The operator places the workpiece 60 on the transport mechanism 50 of the paint unit 10 so that the workpiece 60 can move with the transport mechanism 50.

Step S2: The top inkjet head prints the top surface of the workpiece. Referring to FIG. 3, when the workpiece 60 enters the printing range of the top inkjet head 20 of the lacquering apparatus 10 through the conveying mechanism 50, the inkjet head 20 sprays the lacquer ink on the top surface 61 of the workpiece 60.

Step S3: The first side inkjet head prints the first side of the workpiece. Referring to FIG. 4, when the workpiece 60 enters the printing range of the first set of side inkjet heads 30 of the lacquering apparatus 10 through the transport mechanism 50, the first side inkjet head 30 sprays the lacquer ink on the first of the workpieces 60. Side 62.

Step S4: The conveying mechanism aligns the second side of the workpiece with the second side inkjet head. Referring to FIG. 5, when the second set of side inkjet heads 40 of the lacquering apparatus 10 are to print the second side 63 of the workpiece 60, the transport mechanism 50 rotates the workpiece 60 to align the second side 63 of the workpiece 60. The two-side inkjet head 40 has the second side 63 of the workpiece 60 located within the printing range of the second side inkjet head 40.

Step S5: The second side inkjet head prints the second side of the workpiece. Referring to FIG. 6, when the workpiece 60 enters the printing range of the second set of side inkjet heads 40 of the lacquering apparatus 10 through the transport mechanism 50, the second side inkjet head 40 sprays the lacquer ink on the second of the workpiece 60. Side 63.

It should be noted that the present invention can be divided into a plurality of to-be-printed surfaces according to the printing range of the inkjet head or the shape of the workpiece 60, and the conveying mechanism 50 can horizontally rotate the workpiece 60 to align the to-be-printed surface of the workpiece 60. Printing is performed after the inkjet head, and the effect of continuous printing of the body workpiece can be achieved. And printing device 10 When the ink jet head prints the workpiece 60, the ink paint can be entirely sprayed on the surface of the workpiece 60, and almost no waste paint is generated. If a specific area or pattern needs to be sprayed on the workpiece 60, the printing can be directly performed without the need for a fixture to cover, not only the spraying process is relatively simple, but also the utilization rate of the ink paint is greatly improved, so that the cost of the ink paint is lowered and compared. Environmental protection.

In summary, the present invention has indeed met the requirements of the invention patent, and Patent application. However, the above is only the preferred embodiment of the present invention. The scope of the present invention is not limited to the above embodiments, and is familiar to the above. The person skilled in the art will be able to modify the equivalent modification or change according to the spirit of the present invention. All should be covered by the following patent application.

10‧‧‧Printing device

20‧‧‧ top inkjet head

30‧‧‧First side inkjet head

40‧‧‧Second side inkjet head

50‧‧‧Transportation agency

60‧‧‧Workpiece

61‧‧‧ top surface

62‧‧‧ first side

63‧‧‧ second side

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a lacquering apparatus of a workpiece printing method of the present invention.

2 is a flow chart of a method of painting a workpiece of the present invention.

Figure 3 is a continuation of Figure 1 showing the top ink jet head printing the top surface of the workpiece.

Figure 4 is a continuation of Figure 3 showing the first side inkjet head printing a first side of the workpiece.

Figure 5 is a continuation of Figure 4 showing the transport mechanism aligning the second side of the workpiece with the second side inkjet head.

Figure 6 is a continuation of Figure 5 showing the second side inkjet head printing a second side of the workpiece.

10‧‧‧Printing device

20‧‧‧ top inkjet head

30‧‧‧First side inkjet head

40‧‧‧Second side inkjet head

50‧‧‧Transportation agency

60‧‧‧Workpiece

61‧‧‧ top surface

62‧‧‧ first side

63‧‧‧ second side

Claims (4)

A workpiece printing method is applied to a printing device having a top inkjet head, first and second side inkjet heads and a conveying mechanism, comprising the following steps: (1) placing a workpiece on a conveying mechanism; (2) a top inkjet head prints a top surface of the workpiece; (3) a transport mechanism aligns the first side of the workpiece with the first side inkjet head; (4) a first side inkjet head ranks the first side of the workpiece (5) the transport mechanism aligns the second side of the workpiece with the second side inkjet head; and (6) the second side inkjet head prints the second side of the workpiece. The method of painting a workpiece according to claim 1, wherein the side of the workpiece is divided into a plurality of sides to be printed according to a printing range of the inkjet head or a shape of the workpiece. The workpiece printing method of claim 2, wherein the conveying mechanism level rotates the workpiece so as to be switchable relative to the side inkjet head on the plurality of sides to be printed. The workpiece printing method according to claim 2, wherein the number of the side inkjet heads is set correspondingly according to the number of the plurality of sides to be printed.