Device for applying paste to the inner surface of the hollow-cylindrical electrode of a primary element

The device includes a displaceable cylindrical holder (18), in which a pin (28) is centrally guided. The holder has a hollow space (20) for the paste. The pin (28) is provided with a channel (39), which is connected via side openings (25, 38) to a compressed-air source. The compressed air ensures the bearing of the layer of paste against the inside wall of the electrode (40). Provided one after the other in the lower part of a housing (1) are three additional hollow spaces (22, 24, 26). In the first of these hollow spaces (22) there is a spring (23). The third hollow space (26) is connected by a further side opening (27) to a source of the paste. The pin (28) is displaceable by the piston rod of a piston of a hydraulic cylinder (8) against the force of the spring (23), so that the piston can lift the lower part (32) of the pin (28) off the holder and allow the paste to be discharged from the hollow space (20). With the aid of such a device, the paste can be applied uniformly, in thin layers and over a precisely given section.