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

A processing device comprising:

• a mounting base;
• a cutter holder slidably mounted on the mounting base;
• and
• a brake configured for retracting the cutter holder when the processing device losing power and comprising:
• a driving member comprising
• a main body connected to the mounting base and having two ends;
• and
• a driving shaft movably placed in the main body and having a first end and a second end, the first end and the second end respectively protruding out of the two ends of the main body, the driving shaft being driven by the main body to move in a straight line relative to the main body, and the first end being movably coupled to the cutter holder;
• a resisting member coupled to the second end of the driving shaft and comprising:
• a fastening member sleeved on one end of the driving shaft;
• and
• a sleeve movably sleeved on the driving shaft, the sleeve being positioned between the fastening member and main body;
• and
• an elastic member sleeved on the driving shaft and positioned between the main body and the fastening 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;
• and
• wherein the sleeve comprises a resisting portion therein, the elastic member is partially received in the sleeve, and one end of the elastic member away from the main body resists against the resisting portion.