Patent ID: 7743809

Claim:
A hot-air fabric welder for waterproof tape comprising a main body having a flat work table, a hot-air generating means and an upper roller fitted above the work table, a lower roller unit fitted below said upper roller by a support, the hot-air fabric welder comprising: a lower roller unit ( 10 ) comprises a flat roller portion ( 10 a ) with a uniform circumference and a tapered roller portion ( 10 b ) with a circumference that varies from one end to the other, and either the flat roller portion ( 10 a ) or the tapered roller portion ( 10 b ) can be arranged in turn to correspond to the upper roller ( 111 ) by pivoting of the support ( 20 ) that is driven by the drive of a pivoting means ( 30 ), and a straight welded portion is produced when the flat roller portion ( 10 a ) is arranged below and in correspondence to the upper roller ( 111 ) according to the rotation of said support ( 20 ), and a welded portion of arc shape is selectively produced when the tapered roller portion ( 10 b ) is arranged below and in correspondence to the upper roller ( 111 ).