Importance

Loading Importance Indicators...

Abstract

In the electrically driven dispensing appliance, the electric drive acts via drive screws on thrust plates for dispensing material from cartridges. The drive screws are axially stationary and are in action relationship with a slide bearing said thrust plates. The drive elements which contain the slide and the drive screws are sealingly separated from the cartridge space. The different forces acting upon the two drive screws are supported by rolling friction on low friction bearings so that no tilting forces on the slide are generated. This arrangement does not require expensive longitudinal guides and their sealing. The drive elements are sealingly separated from the remaining appliance parts such as cartridges in an easy manner. The electric drive comprises a first gear motor for a drive under high load during advance and relief, and a second motor for the drive under lower load during the retracting and fast advance motions. During advance and relief, the main shaft connected to the drive screws remains always coupled to the gear motor by a coupling, said coupling being not actuated during dispensing and relief. Thus, the second motor can be a substantially smaller one, and no expensive couplings are necessary.

Loading the Abstract Image...

First Claim