This invention is an installation of a safety apparatus to prevent
safety problems of machine tools caused in work-loading process.
The safety apparatus comprises an actuator, used for connecting
circuits of the machine tool to control its power on-off status,
and a storing unit to ensure the chuck wrench resting at a designated
safe position. This safety system will activate the actuator when
the chuck wrench is returned to the designated position and, therefore,
it will keep the circuits of the machine tool stay active during
the machining operation. On the other hand, this safety apparatus
will remain in power-off status if the chuck wrench is not placed
at the designated position and, therefore, it will make the power
circuits open and paralyze the machine tool operation.
A device for receiving and separating chips and coolant discharged
from machine tools having a filter drum that has an internal bearing
ring on each of its two ends, which each engage in an external bearing
ring so that they rotate together. Spring elements, which run parallel
to the axis of the filter drum, may be provided which are supported
on one side on the internal bearing ring and on the other side on
the external bearing ring. Sealing elements may be provided to prevent
undesired flow of unfiltered coolant.
A device is disclosed for receiving and separating chips and coolant
collecting on machine tools, in which unfiltered coolant is prevented
from penetrating tanks for filtered coolant in the event a receiving
tank overflows. This is achieved in that holders, whose projecting
ends, which are directed downward, extend into an overflow channel,
are tightly attached externally to the wall of the receiving tank.
The overflow channel is guided around the device at a level below
the top edge of the receiving tank and is removably held on the
holders. The overflow channel tightly covers tanks located beneath
it having filtered coolant. The inner edge of the overflow channel
neighboring the receiving tank lies at a higher level than the outer
edge of the overflow channel, which is further away from the receiving
tank, and at least one outlet device is provided in the bottom region
of the overflow channel.
A clamping device for machine tools provided with a chuck, the
clamping jaws of which are actuated by a draw rod, includes a motor
and a driveline arranged between the motor and the draw rod, the
driveline including gearing elements by means of which rotational
movements of the motor required for moving the clamping jaws are
converted into axial displacement movements of the draw rod. Rotational
displacement movements only have to be performed by the motor of
the clamping device in order to clamp a workpiece and to release
the clamping jaws, in which case these rotational movements are
converted into axial displacement movements by means of the driveline
and are transmitted onto the draw rod.