Printing – Stenciling – Stencil and work support
Reexamination Certificate
2001-06-25
2003-05-27
Yan, Ren (Department: 2854)
Printing
Stenciling
Stencil and work support
C101SDIG029, C101S486000, C033S620000
Reexamination Certificate
active
06568321
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a positioning operation for attaching a screen plate including a frame and a screen to a screen printer. The screen plate might be also called as a stencil plate, stencil sheet, screen-mesh, etc.
2. Description of the Related Art
FIG. 5
explains an operation of attaching a screen plate according to the related art.
In
FIG. 5
, a work
53
is placed on a table
51
. Work positioning marks
54
and
55
are written on the work
53
. A screen plate
60
includes a frame
61
and a screen
63
. The screen plate
60
is attached to frame fixing units
66
and
67
so that plate positioning marks
64
and
65
written on the screen
63
respectively correspond to the work positioning marks
54
and
55
. In the related art, the plate positioning mark
64
and the work positioning mark
54
were matched and the plate positioning mark
65
and the work positioning mark
55
were matched just by looking with eyes. After the screen plate
60
was attached, printing for trial was repeated a few times to make a minor adjustment in an attaching position of the screen plate
60
. In this way, the attaching position of the screen plate
60
was determined.
SUMMARY OF THE INVENTION
The screen
63
is a screen-mesh, or the screen
63
is made of a metal. Therefore, even if positioning is tried from a position above the screen
63
, it is impossible to look at the work positioning marks
54
and
55
which are under the screen
63
. Therefore, positioning was performed only by guessing, and it was necessary to print for trial a few times after positioning. The positioning was performed by trial and error.
It is one of objects of this invention to provide a screen printer and a method for setting the screen plate in which the screen plate is able to be attached at a right position in a stage of initializing the screen printer, i.e., so-called alignment stage.
According to an aspect of this invention, a screen printer for performing screen printing by matching positions of a work and a screen plate includes a pointing unit for pointing at a work positioning mark on a work by a pointer. A plate positioning mark on the screen plate is positioned to be matched with the pointer of the pointing unit once the work positioning mark has been pointed by the pointer of the pointing unit.
According to another aspect of this invention, a method for setting a screen plate includes setting a work at a printing position, pointing a light beam at a work positioning mark on the work, and setting a position of the screen plate to match a plate positioning mark on the screen plate with the light beam.
According to another aspect of this invention, the screen printer includes a table for placing a work including a work positioning mark, a pointing unit for pointing by a pointer at the work positioning mark on the work placed on the table, and a fixing unit for fixing a screen plate including a plate positioning mark to be positioned for being matched with the pointer of the pointing unit pointing at the work positioning mark.
Further features and applications of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
Other objects features, and advantages of the invention will be apparent from the following description when taken in conjunction with the accompany drawings.
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patent: 4833985 (1989-05-01), Kojima et al.
patent: 4872407 (1989-10-01), Banke
patent: 5168805 (1992-12-01), Kasanami et al.
patent: 5459941 (1995-10-01), Lowe
patent: 5752446 (1998-05-01), Squibb
patent: 5806424 (1998-09-01), Elliot
patent: 5901646 (1999-05-01), Walker et al.
patent: 5970867 (1999-10-01), Barozzi
patent: 6036994 (2000-03-01), Tanaka et al.
patent: 6338297 (2002-01-01), Wang et al.
patent: 08-118592 (1996-05-01), None
Birch & Stewart Kolasch & Birch, LLP
Micro-Tec Company Ltd.
Yan Ren
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