Patent ID: 8689665
Filing Date: 2014-04-08
Classification: B23Q,B27G,F16D,F16P,Y10T

Abstract:
1. An emergency braking system for abruptly braking a revolving shaft of a machine tool, comprising: a locking device; a diagnostic system configured to check the functionality of the locking device; and at least one brake drum and at least one brake shoe engaged with one another and configured to brake the revolving shaft when the locking device is released; wherein the locking device has at least one blocking element configured to be moved between a locked position and an unlocked position, wherein the blocking element is engaged with the at least one brake shoe in the locked position and decoupled from the brake shoe in the unlocked position; wherein the locking device has an electromagnetic actuator configured to switch the locking device from the locked position to the unlocked position; wherein the diagnostic system is configured to check at least one of (i) the functionality of the actuator and (ii) the functionality of a blocking element of the locking device; wherein the diagnostic system provides a diagnostic current which acts on the actuator of the locking device; and wherein the diagnostic current which acts on the actuator of the locking device is less than a current required to release the locking device.