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Worker crashed while adjusting punch
|[Circumstances of the Incident]
This accident occurred at a plant
manufactures machines to develop photograph
While the details are not fully known,
as the victim was engaged in processing work
all by himself using a turret punch press,
the accident apparently occurred as
a result of the the process indicated below:
A turret punch press is a numerically
controlled machine that can continue
processing once the operator has
the raw materials in place. The machine
the victim was using is estimated to
suddenly stopped during its operation
of some trouble.
After judging that some abnormality
to the crankshaft, the victim climbed
the table and inserted a handcrank
tool) to turn the crankshaft.
When the crankshaft suddenly started to move
again, the handcrank was also rotated, striking
a hard blow to the victim's head.
The handcrank was used roughly once
as a manual tool to adjust any gaps
that occurred when the crankshaft stopped
at the top dead center.
The following can be considered as the causes
of this accident.
1 When the turret punch press stops operations
under the automatic mode, it must be changed
to a manual mode to turn the crankshaft
from the outside. Immediately after the accident,
however, the machine's display indicated
that it was in the automatic mode.
2. The grip portion of the handcrank
victim was using has a length of some
posing a risk of striking anyone within
wide reach. The victim was working
3. Although press machines are legally required
to undergo specified voluntary inspection
once every year, no inspection had been carried
out on the relevant press.
|[Type of business] Optical machines/lens manufacturing
[Type of accident] Crash
[Number of victims] One fatality