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(11) | EP 1 213 062 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Upper tool and upper tool assembly comprising said upper tool for use with a press brake and method of clamping said upper tool |
| (57) In an upper tool for a press brake clamped between a support plate (7) of an upper
tool holder body (5) attached to a lower portion of an upper table (3) and an upper
tool clamp member (11), the upper tool (9) is formed with an inclined surface (9S)
narrowed upward at an upper portion thereof and with an engage groove (9G) engaged
with an engage projection (11K) of the upper tool clamp member (11) and formed under
the inclined surface (9S). Therefore, the inclined surface (9S) is brought into contact
with an inclined surface of the upper tool clamp member (11), when the upper tool
is clamped between the upper tool holder body (5) and the upper tool clamp member
(11), in such a way that clamping force can be further increased when the upper tool
is engaged with a die (63). Further, in an upper tool holder apparatus for a press
brake, the pivotal upper tool clamp member (211) is formed with an engage projection
(211P) engaged with a drop prevention groove (205G) formed in the upper tool (205),
and the upper tool holder apparatus further comprises clamp operation lever (215)
for selectively moving to a clamp position A at which the clamping force can be applied
to the upper tool clamp member (211) from the clamping force generating spring (213)
to clamp the upper tool tightly; an unclamp position B at which the clamping force
can be reduced to allow the upper tool to be adjustably shifted horizontally, and
an exchange position C at which the upper tool clamp member (211) can be moved way
from the upper tool to allow the upper tool to be exchanged vertically with another
one. |