Bag neck sealer

A bag neck sealer comprising a base having a guide trough and an installation wheel thereon, a rotary wheel, a press plate and a movable blade unit disposed close to the guide trough, and a fixed blade unit disposed on one side of the base and located close to the guide trough characterized in:

• said fixed blade unit having a seat and a lid;
• said seat of the fixed blade unit having a cutting slot corresponding to the guide trough of said base, a fixed blade which has an edge protruding into said cutting slot, and a protective piece which being connected with an elastic member to be against one side of said fixed blade opposite to said edge of said fixed blade forming a guiding side wall thereof;
• said lid having a pair of side walls forming a notch corresponding to said cutting slot of said fixed blade unit;
• said lid has a first side wall forming a first angle with respect to said guiding side wall of said protective piece, said lid has a second side wall forming a second angle with respect to said guiding side wall of said protective piece, said first angle being smaller than said second angle;
• said first side wall and said second side wall being in positions parallel to each other;
• and
• said first side wall forms a third angle with respect to said edge of said fixed blade, said second side wall forms a fourth angle with respect to said edge of said fixed blade, said third angle being smaller than said fourth angle.