FIELD: machine building.
SUBSTANCE: lock mechanism (40) of the dosing unit is suggested to secure the end plug (10) of the replaceable material roll, that includes a slot for insertion, located between the intake end (54) and seating area (50) for insertion of the support rod (22) of the end plug (10). The support rod (22) of the end plug has at least one first part (26) with the first diameter, and second part (28) with second diameter, that is below the first diameter. The analyzer (46) of rods of the lock mechanism is at least receiving end (54) and contracts the receiving end (54) such, that only support rods (22) of the plug, having maximum outside diameter in second part (28) equal to the second diameter, have possibility to enter the rejecting slot. From the seating area (50) the rejecting slot (48) goes, it has such dimensions that only support rods (22) of the plug with set maximum diameter of the first part below the said first diameter have the possibility to enter the rejecting slot (48).
EFFECT: improved design.
11 cl, 13 dwg
