Printing method, printing device, printing head, container vesse

Details Printing method, printing device, printing head, container vesse Printing method, printing device, printing head, container vesse

1994-02-22

1998-07-21

Frahm, Eric

Facsimile and static presentation processing

Facsimile

Recording apparatus

358502, 347 3, 347 4, 347 8, 347 43, H04N 123, H04N 146, B41J 300, B41J 25308

Patent

active

057841713

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a printing method, a printing device or a printing head for full-color printing on a printing object, such as paper, plastics or cassettes, a container vessel for containing printing objects, and a printing method for cassettes. More particularly, it relates to a printing method, a printing device and a printing head for a printing object having irregularities on its outer surface.


BACKGROUND ART

In a cassette having housed therein an optical disc or a magneto-optical disc, or a tape cassette having housed therein a magnetic tape, printing is made of logo-marks asserting that the product is manufactured by a certain and certain company, or a variety of design patterns added for increasing the commercial value. For making a printing on these cassettes or the like, the following procedure is employed using offset printing or screen printing as the printing method.
An original or manuscript on which a design to be printed on a cassette is drawn is color-separated by a color scanner.
Each color positive film is prepared depending on the color separation and a master is prepared for each color.
After calibration for each master, test printing is made on a cassette for adjusting the ink viscosity.
Printing is then made after registration of the respective color masters.
Meanwhile, the majority of the above-mentioned printing processes are carried out by a manual operation by experienced operators. Consequently, fluctuations tend to be produced in picture pattern matching of white colors for solid printing, three prime colors, sepia or top coats, ink color modulation or ink viscosity adjustment. Besides, difficulties are presented in the master exchange or master registration operations for color matching, while plural printing objects cannot be printed collectively. Since the masters need to be produced to suit the respective colors, production costs are unavoidably raised.
On the other hand, the cassettes are usually produced by injection molding of synthetic resin. Consequently, warps, bends or sinks are produced, although to a limited extent, due to contraction caused by cooling proper to the resin during injection molding, thereby worsening the planarity of the printing surface of the cassette. Above all, with the solid full surface printing of the planar portion of the cassette, slight warping, bending or irregularities produce contact shortage with a transfer roll resulting in color fluctuations, color dropout or color blurring, thereby lowering the printing quality.
It may be contemplated to raise the printing transfer pressure for improving the contact of the transfer roll with the cassette. However, if the transfer pressure is raised, the rubber layer of the transfer rubber roll layer is distorted to cause distortion in the printed picture or letters. In addition, the negative or letter tends to be contaminated due to the elevated transfer pressure at the time of resetting of the deformed cassette, thereby markedly lowering the printing quality or causing cracks or printing interruptions depending on the type of the cassette material. Thus the printing may be made only on the planar portions of the cassette.
Recently, a proposal has been made for employing an ink jet type printing head for printing on the cassette.
With this proposal, a horizontal injection type ink jet printing head is used for injecting the ink in the horizontal direction because the casing for housing the printing object therein is contaminated by ink dripping with the commercial ink jet for sealing. With this printing head, a printing object 101 is transported in the vertical direction by a transport unit mainly consisting of an electric motor 103 and the ink is jetted forth onto the transported printing object in the horizontal direction as shown in FIG. 1. The printing object 101 shown herein is tape-shaped.
Meanwhile, the standard size cassette has a planar portion, a recessed area for labelling, a convexed area, chamfered curved or inclined portions or the like, with the warping duri

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