Printing – Stenciling – Traveling-inker machines
Patent
1992-10-19
1993-11-30
Eickholt, Eugene H.
Printing
Stenciling
Traveling-inker machines
101126, B05C 1704
Patent
active
052655334
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a silk screen printer and more particularly to a silk screen printer of the kind which comprises a printing table, a frame-held stencil, and a squeegee which can be displaced relative to the stencil frame, such that a first pattern formed on the stencil can be applied to print material registered in a printing position on said table and therewith form a second pattern on said material, by forcing ink, paste, lacquer or varnish through a pattern of holes formed in the stencil and corresponding to said first pattern, with the aid of said squeegee.
The invention is concerned particularly with silk screen printers of the kind in which the printing table is flat and functions to support thin material to which the second pattern is to be applied.
Although the printer is constructed to print thin material, it will be understood that the printer is also able to print thick and stiff material, provided that said material can be held firmly by grippers provided therefor.
BACKGROUND ART
Various silk screen printer of this kind are known to the art. In addition to endeavours to increase the printing speed of such printers, endeavours have also been made constantly to enable the second pattern to be applied to print material with no positional discrepancy or with only a small positional discrepancy.
The demand for high printing speeds, e.g. speeds in excess of 1500 prints per hour, is normally counter-active to the demand for small positional discrepancies.
An example of one known printer equipped with a flat printing table with which a high printing speed is desired and where discrepancies can be kept low is described and illustrated in U.S. Pat. No. 4,516,495.
In view of the measures taken in the development of the present invention, mention should perhaps also be made to U.S. Pat. No. 3,874,289, and particularly to FIGS. 8 and 9 of this specification, which teaches a silk screen printer which lacks a flat printing table but in which measures have been taken to cause the squeegee to move over the stencil and relative to the stencil frame in a first direction during an actual printing sequence while the stencil and stencil-frame are arranged to move in a second direction opposite to said first direction. The second direction coincides with the speed and direction of the movement of a flat and/or an angled object. It can be assumed that the speed of the object in relation to a stand which forms part of the silk screen printer is synchronized with the speed of the stencil frame relative to said stand.
SUMMARY OF THE INVENTION
Technical Problems
A study of the present standpoint of techniques as described above will show that in the case of a silk screen printer equipped with a flat printing table, a frame-carried stencil, and a squeegee which can be moved relative to the stencil-frame, a qualified technical problem resides in the ability to create, with the aid of simple means, conditions which will enable movement of the squeegee, the length of squeegee movement, and the length of stencil or stencil-frame movement to be reduced, so as to enable the printing speed of the printer to be increased drastically as a result of these shorter distances.
It will also be seen that a technical problem resides in the provision of a silk screen printer equipped with a flat printing table and intended for printing relatively thin material with which the aforesaid problem has been solved and therewith provide a simple gripping arrangement and a simple movement of print material from a laying-on position to a printing position and from a printing position to a laying-off.
Another technical problem associated with a silk screen printer of the aforesaid kind equipped with a flat printing table is one of realizing the advantages that can be gained when the printing table is able to move reciprocatingly in synchronism with the stencil and stencil-frame, and also of realizing that the gripper means need not be registered relative to the printing table solely in a known manner, but c
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Svantesson, deceased Ake
Svantesson, legal representative by Kirsti K.
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