JPS6113989B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for printing, for example, woodgrain printing, on a curved surface such as an uneven surface or a curved surface.

As a prior art related to this type of curved surface printing, there is a printing method using hydraulic pressure as shown in Japanese Patent Application Laid-open No. 21914 of 1972, for example, but in this method, a swellable transfer film precedes the printing material. Since the liquid is spread on the water surface, there is a risk that swelling may proceed too much prior to transfer, or that transfer may be inhibited by ripples on the water surface.

The present invention provides a curved surface printing device that can solve the above-mentioned problems.

The device of the present invention will be explained below with reference to the accompanying drawings.
Reference numeral 1 denotes a swellable transfer film, which is wound into a roll, pulled out from one end, and stretched onto the transfer section 2 .

The film 1 has a transfer pattern 3 printed on its upper surface 11, and this pattern 3 is usually printed just before the transfer section 2 by a printing means 4 equipped with an ink roller 41 and a printing roller 42. However, in some cases, a printed surface that has been previously printed and is in a dry state may be melted and formed in a transferable manner in an activation chamber (not shown) by, for example, spraying a solvent mist.

The transfer section 2 places the film 1 with its pattern forming surface 11 facing upward, and also feeds the film 1 intermittently to transfer the pattern 3 to one transfer position P, and stops at the position for a predetermined period of time. an endless conveyance belt mechanism 21 for pressing the printing material 5; a substrate holding means 22 for holding the printing material 5 so as to face the pattern 3 of the film 1 at the printing position P; and an elevating device for pressing the printing material 5 against the pattern 3. Means 2
3.

The endless conveyor belt mechanism 21 includes an endless belt 211 made of a water-containing cushion material, such as a thick sponge material, and stretched so as to place the film 1 thereon, and a drive means such as a drive roller that makes the belt run intermittently. 212, a water supply means for moistening the belt 211 before the printing position P, such as a scrubber 213, and a cleaning means for removing residue adhering to the surface of the belt 211 before the water supply means, for example a scrubber 214 and a removal doctor 215. It is equipped with The printing material holding means 22 may be configured to grip or stop the printing material 5, and has no particular structural features.

The elevating means 23 is configured to press the printing material 5 onto the belt 211 and press-fit it into the belt 211 as shown in FIG. 2B, and is normally configured to raise and lower the holding means 22. In some cases, the belt 211 may be configured to move up and down.

In order to press the printing material 5 well, a contact plate 216 is disposed inside the belt 211, and in order to bring the film 1 into close contact with the belt 211, a blowing means is provided on the film supply side of the belt 211. 6 is provided, and the film 1 is brought into close contact with the belt 211 by the blowing means 6, and the moisture of the belt 211 is adsorbed.

In the above, the film 1 does not necessarily have to be a series of films, but may be a single piece of film on which the pattern 3 is printed in one place.In this case, the film 1 is attached to the belt 211. 1 will be supplied sequentially to one sheet.

The above-mentioned film 1 may be made of polyvinyl alcohol, wafer, etc., but if it is made of wafer, it has the advantage that it does not cause any pollution even if it is removed by washing with water. There is also the benefit of being able to remove it.

Since the apparatus of the present invention is as described above, the film 1 placed on the belt 211 is
At the same time, the pattern 3 is stopped at the printing position P as shown in FIG. 2A, and then the printing material 5 is pressed.

When the printing material 5 is relatively pressed against the belt 211, it is press-fitted into the belt 211 as shown in FIG. At this time, the belt 211 is impregnated with water, so
Even if a gap S is generated between the temporary belt 211 and the curved surface 51, this gap S is filled with water W pushed out from the belt 211 and applies back pressure to the film 1, so that the film 1 is brought into close contact with the curved surface 51. I can do it. When the printing material 5 is separated from the belt 211, the pattern 3 is transferred to the curved surface 51 and the film 1 is attached to the curved surface 51 and the belt 211, so the attached film is removed from the printing material 5 by a separate means. The belt 211 resumes running and supplies the new pattern 3 to the printing position P. Therefore, as the belt 211 continues to run, the residue of the film 1 is removed by the shower 214 and the doctor 21 as cleaning means.
It is washed and removed by 5.

Since the device of the present invention is as described above, when it is used, the following effects can be obtained.

Since the swellable film 1 is placed on the water-containing belt 211 and transported, it is possible to prevent the film 1 from stretching before the transfer, thereby enabling accurate transfer, as well as regulating the position of the film 1. In addition, since the belt 211 is impregnated with water and absorbs and transfers the film 1, and also serves as a cushion during transfer, the transfer is easy and reliable.

Therefore, the apparatus of the present invention can be used with great effect for this type of printing, the demand of which will continue to increase in the future.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the configuration of the device of the present invention;
The figure is an explanatory diagram showing the operation of the above device step by step. In the figure, 1 is a transfer film, 2 is a transfer part, 21
211 is an endless conveyance belt mechanism, 211 is a belt, 212 is a driving means, 213 is a shower as a water supply means, 21
4 is a scrubber as a cleaning means, 215 is a removing doctor, 216 is a contact plate, 22 is a printing material holding device, 23 is a lifting device, 3 is a pattern, 4 is a printing device, 5 is a printing material, 51 is a curved surface, 6 is a blowing means;
P indicates the printing position, respectively.

Claims (1)

[Claims] 1. An endless conveyor belt mechanism comprising an endless belt made of a water-containing cushion material, a driving means for causing the belt to run intermittently, a water supply means for impregnating the belt with water, and a cleaning means for removing residue from the belt. a holding means for holding the printing material opposite the belt through a space at the printing position; and a lifting means for forcing the printing material into the belt by relatively approaching and separating the belt and the holding means; The swellable transfer film is moistened by the water-containing belt by the water supply means and transported so that the pattern stops at the printing position, and the printing material is pressed into the belt while being brought into contact with the pattern by the lifting means. to transfer the pattern to the printing material,
A printing device characterized in that a belt surface after transfer is cleaned by a cleaning means before water is supplied.