Upper tool and upper tool holding device for press brake

The upper tool holding device for a press brake, for removably mounting an upper tool on an upper table of the press brake, comprising:

• a holder body attached to the upper table;
• a support plate provided on a lower portion of said holder body;
• an upper-tool pressing-down and fixing member attached to said holder body, for fixedly pressing-down an upper portion of an upper tool in cooperation with said support plate;
• a clamping-force producing device having an elastic member, the clamping-force producing device being adapted to adjust clamping force of said upper-tool pressing-down and fixing member;
• and
• a clamp releasing device for releasing the pressing-down of the upper tool;
• wherein said clamping-force producing device comprises;
• an adjust screw engaged with a nut member to adjust an engage position between the two;
• a ring member fitted to said adjust screw so as to be axially shiftable;
• and
• an elastic member disposed between a head portion of said adjust screw and said ring member.

The upper tool holding device for a press brake, for removably mounting an upper tool on an upper table of the press brake, comprising:

• a holder body attached to the upper table;
• a support plate provided on a lower portion of said holder body;
• an upper-tool pressing-down and fixing member attached to said holder for fixedly pressing-down an upper portion of an upper tool in cooperation with said support plate;
• a clamping for producing device having an elastic member, the clamping force producing device being adapted to adjust clamping force of said upper-tool pressing-down and fixing member;
• and
• a clamp releasing device for releasing the pressing-down of the upper tool;
• wherein two upper-tool pressing-down and fixing members are pivotally supported on both side surfaces of the holder body, and said clamping-force producing device is used in common for both said upper-tool pressing-down and fixing members.