device for limiting the level of farbtümpels before the squeegee inside a template of a siebdruckmaschine

摘要

The control of printing ink in a container used in a screen printing process if effected by a pneumatic nozzle sensor located over the liquid surface to close a relay coupled to the supply pump. A motor driven blower supplies low pressure air over a pipe to a diaphragm operated relay which has a rigid outlet tube. A flexible tube passes into the supply tank. The outlet nozzle is located at the required liquid depth. When the liquid level blocks the nozzle, the line pressure rises to switch the diaphragm actuated relay. The supply pump motor is shut down and flow into the tank ceases. The required head in the tank may be adjusted by sliding the rigid tube horizontally.