Brake and processing device using the same for a cutter device in processing apparatus

A brake adapted for a processing device having a cutter holder, the brake comprising:

• a driving member comprising:
• a main body having two ends;
• and
• a driving shaft movably placed in the main body and protruding out of the two ends of the main body, the driving shaft being driven to move in a straight line by the main body, and the driving shaft having one end and another end, wherein the one end being movably coupled to the cutter holder;
• a resisting member coupled to the another end of the driving shaft away from the cutter holder;
• and
• an elastic member positioned between the main body and the resisting member;
• wherein the driving shaft is configured to move toward one side of the driving member adjacent to the elastic member under an elastic restoring force of the elastic member, whereby the driving shaft creates drag on the cutter holder, and the cutter holder moves with the driving shaft toward one end of the driving member adjacent to the elastic member.