Printing – Stenciling – Processes
Reexamination Certificate
2000-07-28
2002-04-09
Yan, Ren (Department: 2854)
Printing
Stenciling
Processes
C101S126000, C101SDIG029
Reexamination Certificate
active
06367378
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a reel feed screen printing method and printing machine. More particularly, it relates to a reel feed screen printing method and printing machine capable of avoiding contact of the printed portion of the film positioned at the drying oven side with the drying oven inlet or the like.
BACKGROUND ART
Hitherto, as a method of printing an image on a substrate, for example, a printed wiring board, screen printing is known, which is to print on the object of printing rubbing out ink from a stencil screen by means of a squeegee.
FIG. 8
shows a structure of a conventional reel feed screen printing machine. This printing machine
100
reels out a PET film F′ coated with a ceramic thin film from a reel feed roller
101
by a specified length each, prints on the ceramic thin film by means of a stencil screen
102
, dries the printed portion by a drying oven
103
, and takes up by a reel-up roller
104
.
Such reel feed printing method is superior in working efficiency and effective to lower the manufacturing cost, as compared with the method of printing on each one of preliminarily cut sheets.
Hitherto, if precise print position is required as in the case of overlap printing of an image on an already printed image, at the time of first printing, a positioning mark is printed together with the print pattern, and this mark is taken by, for example, a CCD camera, and the position of the object of printing is adjusted on the basis of the taken image information.
However, in the positioning method by using image pickup means such as CCD camera, the CCD camera is placed between the object of printing and the screen, and the distance of the object of printing and the screen is wider than usual. Therefore, when bringing the object of printing and the screen closer to each other at the time of printing, the camera must be set aside, and the object of printing or the screen must be moved a relatively long distance, but since the screen requires a considerably wide area than the printing area of the object of printing, when the screen is moved, the camera withdrawing distance is very long, and one process becomes long.
Accordingly, a method of printing by fixing the screen and bringing the object of printing closer to the screen is advantageous in working efficiency, but in this case, in the printing machine
100
in
FIG. 8
, the PET film F′ is lifted about the printing area, and the printed portion may contact with the inlet of the drying oven
103
, and the machine may be contaminated or the printing result may be poor.
The invention is devised in the light of the above problems of the prior art, and it is hence an object thereof to present a reel feed screen printing method and printing machine capable of avoiding contact of the printed portion of the film positioned at the drying oven side with the drying oven inlet or the like.
SUMMARY OF THE INVENTION
A first aspect of reel feed screen printing method of the invention is a reel feed screen printing method for performing screen printing while feeding a roll film by a specific stroke, in which the drying oven side of the film is slackened at the time of printing.
A second aspect of reel feed screen printing method of the invention is a reel feed screen printing method for performing screen printing while feeding a roll film by a specific stroke, in which the print table is lifted up to a printing position while moving in the drying oven direction by a specific stroke.
In the reel feed screen printing method of the invention, preferably, the drying oven side of the film is thrust downward.
A first aspect of reel feed screen printing machine of the invention is a reel feed screen printing machine for performing screen printing while feeding a roll film by a specific stroke comprising film slackening means for slackening the drying oven side of the film at the time of printing.
A second aspect of reel feed screen printing machine of the invention is a reel feed screen printing machine for performing screen printing while feeding a roll film by a specific stroke comprising print table sliding and lifting means for lifting the print table up to a printing position while moving in the drying oven direction by a specific stroke.
The reel feed screen printing machine of the invention, preferably, further comprises film downward thrusting means for thrusting the drying oven side of the film downward.
The invention is thus constituted, and hence the printed portion positioned at the drying oven side of the film at the time of printing is prevented from being damaged by contacting with, for example, the upper part of the inlet of the drying oven. Accordingly, the product quality and yield are enhanced, and soiling of the drying oven inlet with ink or the like can be avoided.
REFERENCES:
patent: 3973493 (1976-08-01), Black et al.
patent: 4729305 (1988-03-01), Spencer
patent: 4781088 (1988-11-01), O'Connor et al.
patent: 4909143 (1990-03-01), Van den Berg et al.
patent: 5777878 (1998-07-01), Helmrich et al.
New Create Corporation
Rader & Fishman & Grauer, PLLC
Yan Ren
LandOfFree
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