Assembly Method and Assembly Apparatus for Assembling the Washing Group of a Laundry Washing Machine

摘要

A method is set forth for assembly of the washing group (1) of a laundry washing machine including a washing tub (2) and a rotatable drum (3). The tub (2) is formed of a rear half-shell (4) and a front half-shell (5) made of plastic and coupled to one another in a watertight manner. The method includes placing the rear half-shell (4) into a first supporting template (6), in a coupling position in which a perimetrical annular rim (4a) of the rear half-shell (4) is faced to the outside of first supporting template (6); fitting/inserting the drum (3) into the rear half-shell (4); placing the front half-shell (5) of the washing tub (2) into a second supporting template (7), in a coupling position in which a major annular rim (5a) of the front half-shell (5) is faced to the outside of the second supporting template (7); and arranging the first (6) and second supporting templates (7) so as to put the perimetrical annular rim (4a) of the rear half-shell (4) in abutment against the major annular rim (5a) of the front half-shell (5). Before starting a vibration welding process, the starting distance (d1) between the front opening (3a) of the rotatable drum (3) and the minor annular rim (5b)/front opening of the front half-shell (5) is measured. This and other input are used in control of the process. The invention concerns also an assembly apparatus for carrying out an assembly method as described. The apparatus comprises the mentioned first supporting template (6) and second supporting template (7). The assembly apparatus further includes a measuring device adapted for measuring the distance between the front opening (3a) of rotatable drum (3) and a minor annular rim (5b)/front opening (2a) of the washing tub 2.