Automatic tool changing device for machine tools

An automatic tool changing device for machining tools, the machining tools individually comprising a bed movably carrying a table to allow said table to be movable along an X-axis of the bed, a column positioned at a side of said bed to be movable along a Y-axis of the bed, and a spindle stock positioned in front of said column to be movable along a Z-axis of the bed with a tool carrying arbor being held to said spindle stock, comprising:

• arbor rotation guide means provided on said bed at a position around the table and adapted for guiding a rotating action of a plurality of tool carrying arbors, said arbor rotation guide means including a cylindrical housing and a first bracket adapted for connecting a bottom of said cylindrical housing to said bed, said cylindrical housing having:
• an annular guide groove formed on an inner diameter wall of the cylindrical housing at a lower portion, thus guiding a rotating action of a plurality of arbor holders of said arbor rotation means;
• and
• an opening formed on said cylindrical housing at a top portion opposite to said annular guide groove, said opening allowing a roller of an arbor holder associated with the selected arbor to be rotatable to the front prior to being removed from the arbor holder when the selected arbor is shifted from its horizontal position to its vertical position;
• arbor position changing means positioned above said arbor rotation guide means and adapted for selectively changing a position of a selected one of said arbors from its horizontal position to its vertical position;
• arbor rotation means installed inside said arbor rotation guide means and adapted for rotating said arbors;
• and
• tool changing means positioned between said arbor rotation means and said spindle stock and adapted for changing an existing arbor of said spindle stock with said selected arbor.

An automatic tool changing device for machining tools, the machining tools individually comprising a bed movably candying a table to allow said table to be movable along an X-axis of the bed, a column positioned at a side of said bed to be movable along a Y-axis of the bed, and a spindle stock positioned in front of said column to be movable along a Z-axis of the bed with a tool carrying arbor being held to said spindle stock, comprising:

• arbor rotation guide means provided on said bed at a position around the table and adapted for guiding a rotating action of a plurality of tool carrying arbors;
• arbor position changing means positioned above said arbor rotation guide means and adapted for selectively changing a position of a selected one of said arbors from its horizontal position to its vertical position, said arbor position changing means including
• a drive unit having an actuator at the center of said arbor position changing means;
• a lift selectively ascending or descending by said drive unit, said lift having a groove connected to a plurality of arbor holder units of said arbor rotation means, thus selectively shifting the position of the selected arbor between its horizontal and vertical positions;
• and
• a second bracket positioned at a side of said drive unit and adapted for holding a position of said tool changing means;
• arbor rotation means installed inside said arbor rotation guide means and adapted for rotating said arbors;
• and
• tool changing means positioned between said arbor rotation means and said spindle stock and adapted for changing an existing arbor of said spindle stock with said selected arbor.

An automatic tool changing device for machining tools, the machining tools individually comprising a bed movably carrying a table to allow said table to be movable along an X-axis of the bed, a column positioned at a side of said bed to be movable along a Y-axis of the bed, and a spindle stock positioned in front of said column to be movable along a Z-axis of the bed with a tool carrying arbor being held to said spindle stock, comprising:

• arbor rotation guide means provided on said bed at a position around the table and adapted for guiding a rotating action of a plurality of tool carrying arbors;
• arbor position changing means positioned above said arbor rotation guide means and adapted for selectively changing a position of a selected one of said arbors from its horizontal position to its vertical position;
• arbor rotation means installed inside said arbor rotation guide means and adapted for rotating said arbors said arbor, rotation means including
• a rotary housing having:
• a plurality of arbor holder units regularly positioned on an inner diameter wall of said rotary housing and individually holding a tool carrying arbor;
• a driven gear formed on said rotary housing;
• and
• a guide groove formed on said rotary housing at a position around said driven gear;
• a drive unit having:
• a drive motor positioned at a side of said driven gear of the rotary housing;
• and
• a drive gear engaging with both an output shaft of said drive motor and said driven gear of the rotary housing, thus selectively rotating the rotary housing by a rotating force of the drive motor;
• and
• a plurality of guide rollers installed on said rotary housing at regular intervals and engaging with said guide groove of the rotary housing, thus guiding a rotating action of said rotary housing in cooperation with said guide groove while preventing the rotary housing from any eccentricity;
• and
• tool changing means positioned between said arbor rotation means and said spindle stock and adapted for changing an existing arbor of said spindle stock with said selected arbor.