US 5,787,805 AGranted

Screen printing apparatus with off contact

AssigneeElexon Ltc.

InventorsAlexander Szyszko, Rick Lee Fuoua, Thomas Burke Lyden, Mariusz Smialek, Marek Dudek

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Abstract

A screen printer prints ink on a plurality of substrates being carried by traveling pallets passing successively through printing stations. A manually operable controller is located at each printing head to operate position-controllable motors, such as stepping motors, to raise or lower a screen printing frame assembly to change an off-contact distance between it and an underlying substrate. A display at each printing head shows the relative distance being raised or lowered with operation of the manually-operable controller. Preferably, the stepper motors are positioned at the four corners of the screen printing frame. A common controller has a display for showing an operative or inoperative status of a screen printing head at each station and circuits to render the printing heads operative or inoperative. The controllers preferably are operably by a touch pad. The screen printing machine may have its off-contact changed easily and quickly at any printing station, or globally at all printing stations by operation of touch pads at a station or a common controller.

Claims10

Dependent claims

In a screen printer for printing ink on a plurality of substrates through a plurality of screen printing stations, the combination comprising:

a frame;
a plurality of printing heads each pivotally mounted on the frame for movement between an open position and a closed printing position;
a screen printing frame assembly having a printing screen mounted on each printing head for movement relative to its associated printing head;
traveling pallets carrying the substrates successively through the printing stations;
position controllable electric motors mounted on each printing head and connected at spaced locations to the printing head to raise and lower the printing screen;
an electrical control apparatus for operating the position controllable electric motors for shifting the printing screen frame relative to the printing head;
a manually operable controller at each printing head operable by an operator at each printing head to cause the position controllable electric motors at its associated printing head to raise or lower the screen printing frame assembly to change an off-contact distance between the latter and the substrate;
and
a display at each printing head showing the relative distance being raised or lowered with the operation of the manually-operable controller.

6 more elements

Dependencies are inferred from the claim text.