Printing – Stenciling – Stationary-inker machines
Patent
1992-10-02
1994-01-11
Burr, Edgar S.
Printing
Stenciling
Stationary-inker machines
101126, B05C 1704
Patent
active
052771105
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a stencil printing machine, and then particularly to a stencil printing machine which is equipped with a printing table for supporting print-material.
The principles of the invention may be applied with stencil printing machines equipped with a fully cylindrical printing table and in which the printing table movement is effected in conjunction with a "stop cylinder function or a "swing cylinder function", although it will be understood that the invention can also be applied in machines in which the surface of the printing table is only partially cylindrical.
The invention takes as its starting point a stencil printing machine of the aforesaid kind which is provided with a reciprocatingly movable stencil frame, a stencil fitted to said frame, and a squeegee arrangement which, during movement of the stencil frame and printing table, functions to press a printing substance through a first pattern formed on the stencil, and onto print material located between the table and the stencil, such as to produce a second pattern.
The present invention also relates to the use of means for compensating for distortion of the first pattern, or stencil pattern, during a printing sequences this distortion resulting from stretching of the cloth by the squeegee arrangement as it moves across the cloth.
BACKGROUND ART
A stencil printing machine of the aforesaid kind is illustrated and described in U.K. Patent Specification No. 1,594,660, in which FIGS. 6-13 in particular illustrate a stencil printing machine of a kind with which the present invention can be said to constitute a further development.
FIG. 1 of the aforesaid-published patent specification also illustrates the discrepancy caused by a squeegee arrangement when the stencil is stretched during a printing sequence, and also illustrates how such distortion in the first or stencil pattern caused by stretching of the stencil cloth can be compensated for.
Also belonging to the present state of the art is an arrangement which is illustrated and described in U.S. Patent Specification No. 4,715,278. Among other things, this published patent specification illustrates a side view of a printing table and a stencil fitted to a stencil frame, and also illustrates schematically a discrepancy-compensating device which functions to reduce the discrepancy that would otherwise occur between the first pattern carried by the stencil and the second pattern printed on the print material should no compensation be made.
Also forming part of the present state of the art is the arrangement illustrated and described in European Patent Specification No. 0 285 587. This arrangement includes means for compensating for pattern-distortion that occurs in the stencil during a printing sequence as a result of stretching of the stencil cloth when printing in two mutually opposite directions.
SUMMARY OF THE INVENTION
Technical Problems
When considering the earlier state of the art, as described and illustrated in the aforesaid published specifications, and then in Particular in the U.K. Patent Specification No. 1,584,660, it will be seen that a technical problem resides in the provision of simple means which will enable full or partial compensation to be made for pattern distortions occurring in the stencil during a printing sequence as a result of the tensile forces (cloth stretching) which the squeegee arrangement exerts on the stencil in a stencil printing machine that includes a curved printing table.
It will also be seen that a technical problem resides in the provision of such compensating means which are not only usable with pivotal cylinder machines or stop cylinder machines, but also with stencil printing machines equipped with sector-configured printing tables.
It will also be seen that a technical problem is one of realizing the simplifications that can be expected when said compensating means includes, among other things, a guide rail and a slide which can move along said rail in response to stencil frame movement during a printing s
REFERENCES:
patent: 3941053 (1976-03-01), Black et al.
patent: 4193344 (1980-03-01), Ericsson
patent: 4589336 (1986-05-01), Klemm
patent: 4802410 (1989-02-01), Ericsson
patent: 4854229 (1989-08-01), Vassiliou
patent: 4909145 (1990-03-01), Ericsson
patent: 4998470 (1991-03-01), Klemm
Burr Edgar S.
Svecia Screen Printing Systems AB
Yan Ren
LandOfFree
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