Cutting by use of rotating axially moving tool – With randomly-actuated stopping means – Responsive to condition of tool or tool-drive
Patent
1996-10-24
1999-01-12
Bishop, Steven C.
Cutting by use of rotating axially moving tool
With randomly-actuated stopping means
Responsive to condition of tool or tool-drive
408 9, 408 11, 408 14, 408 17, 408128, 408135, 474 70, 474273, B23B 4716, B23B 4724, B23B 4900
Patent
active
058578145
ABSTRACT:
An apparatus for controlling a tapping-drilling machine is disclosed in which holes can be formed by means of drilling tools, and threads can be formed by means of tapping tools. A worm is elongately formed on a spindle, and a worm wheel which is meshed with the worm is secured by a lateral shaft. At the leading end of the lateral shaft, there is installed a brake. In the preferred embodiment of the present invention, the electronic type brake is employed, and the electric current flowing through this brake is adjusted, so that the velocity of the vertical movement of the spindle sleeve (which is defined to be the ratio of the vertical moving distance to the revolutions of the spindle) can be automatically adjusted. For this purpose, an overall supervising controller in the form of a micro-controller is provided to receive sensed data from a spindle revolution sensing section, a revolution deviation (difference) sensing section, a spindle sleeve position sensing section and a manipulation switching section so as to output computed control data to an electronic brake control section, a motor forward/reverse driving section and an operation and alarming display section. Thus during a tapping or drilling operation, the micro-controller controls the pre-requisite functions for the automation of the tapping or drilling operation such as a step feeding function, a chip breaking function, a dual feeding function, a dwelling function, an overload protecting function, and the motor forward/reverse driving function.
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